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Full text of "Radio Electronics (September 1992)"

SEPTEMBER 1992 



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BUILD THIS 



I 



VOICE-EFFECTS BOABO 

Use digital — ■ 

signal < 

processing 

technology \ 

to change \ 

your voice \ 

or create \ 

fun effects! \ 



Combined 
with 







ai3 



V5?>a»*' ii. 



NOT WORKING 
TO NETWORKING 

Basic and advanced 

equipment for 

troubleshooting 

\ LAN's 







THE SLOPING \ 
VEE ANTENNA ] 

The perfect 
home-built 
antenna for hams } 
and shortwave \ 
enthusiasts! ^ 

AMATEUR TV i 

DOWNCONVERTER ^ 

Use a standard TV \ 
to view \ 

ATV signals 

CIRCUIT COOKBOOK 

Learn — or re-learn — how to use 
the 555 timer 



J;^vv^^^' 



Vw-WS 







^ 

n 











0< 


? 





09128 


AS783 










$3.50 U.S. 
$3.9S CAN 



GERNSBACK 



I3:s3;3c*3;*: CAR-RT SORT xx CRQ3 
75D456HRR5165Mn93 D9 6D 

NOU 93 
RB 

53151 




We Only Skimped OnThe Price. 

Introducing The Fluke Series 10 — From $69.- 



Actual size: Easy to carry, 
easy to jse 



New! V Chek'": For fast accurate 
checks on power sources and 
supplies, set your meter or V Chek — 
and let it do the rest. V Chek will 
determine continuity/ohms; if voltage 
is present, it will automatkaily 
charge modes to measure AC or DC 
volts, whichever is detected. For most 
initial troubleshooting checks, here's 
the only setting you need to make. 



Fluke quality: Made in the USA hy Fluke, 
with the same rugged reliability that's made 
us the world leader in digital multimeters. 
Count on hard-working high performance— 
and a two-year warranty to back it up. 



Large, easy-to-read display: 
'lOOO count digital readout. 



Audible Continuity: 

To perform fast continuity 
checks, just listen for 
the beep; no need to watch 
the display. 



Nswl TL75 Hard Paint" Test Leads 

Comlort grip with extra strong tips 
for extended service life. 



riuke 10 




Hew! Min/Max recurd with relative 
time stamp and Continuity Capture™: 

Makes intermittent problems easier to 
find. Records highs and lows — and 
'time stamps'" when they occurred. In 
continuity mode, opens or shorts as brif 
as 250 (js are captured and displayed. 



CapaDltance: Autoranging from 
.001 uFto 9999 |.iF. No need to carry 
a dedicated capacitance meter. 



For high perlcrmance at Fluke's lowest price, ge 
your hands on the new Series 10. Stop by your 
local Fluke distributor and feel what a powerful 
difference the right multimeter makes — at the 
right price. For afree product brochure orthe nam 
of your nearest distributor, call 1-800-87- FLU Kt 



S69.95- 

4000 count digital 

dispidy 
1 5% tfasicdc volts 

accuracy 
2.9% basic acvotis 

accuracy 
1.5'^ basic ohms 

accuracy 
Fasl conlinuity 

beepef 
Pi ode Test 
Sleep hAbde 
Two-year warranty 



riuke 11 



S79.95- 
VChsli™ 
Cipacilance, 

.001 to 9999 tiF 
4000 coubl digital 

display 
0.9%I]asicdc 

vfllts accuracy 
1.9% basic acvDits 

accuracy 
0.9% basic ohms 

accuracy 
Fasi conlinuity 

beeper 
Diode Tesl 
Sleep Mode 
Two-year warranty 



riuhe 12 



S39.S5- 
VChek™ 
Min/Mai record I bj 

Whih relative 

lime stamp 
Conlinuily 

Capture'" 
Capacitance. 

001 to 9999 uF 
40O0 CO unl digital 

display 
0.9% basic dc 

volts accuracy 
1.9% basic acyolt 

accuracy 
99% basic ohms 

accuracy 
Fast continuity 

beeper 
Diode Test 
Sleep Mode 
Two-year warrant] 



Suggested U.S. list price. 



Optional fjolster wItt 
mt-stsnit avsilabte 




The New Series 10, 
A Small Price For A Fluk 

FLUKE AlvlD PHILIPS 

THE T&M ALLIANCE 

©1991 John Fluke Mfg. Co.. Inc. Prices and specifications 
subject to change. Ad no. 00130. 



CIRCLE 121 ON FREE INFORMATION CARD 



September 1992 BBcaa^, 



Vol. 63 No. 9 




37 VFX DIGITAL SIGNAL PROCESSOR 

Use this voice effects processor to change the pitch of your voice 
and to create special effects. 
Craig Borax and David BecIc 

71 SLOPING VEE AIMTENNA 

A low-cost boost for your shortwave or ham transmissions. 
Richard A. Formata 

79 ATV LINEAR AMPLIFIER 

Our low-noise downconverter lets you receive amateur TV signals on 

a standard TV! 

William Sheets and Rudolf F. Graf 



The 555 

A Versatile 
Timer <1 " 



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L^M ■ ^ ^ Hf ^UM ^HV JC «^ 












PAGE 58 




53 NOT WORKING TO NETWORKING 

Basic and advanced equipment for troubleshooting local-area 

networks. 

Gary McClellan 



fc^^HiK-iiimm 



■'l^^'^'^^-l^'^^- 




58 THE 555: A VERSATILE TIMER 

Learn how to use the 555 in practical timer applications 
Ray M. Marston 



110 Advertising and Sales 
OHices 



8 


VIDEO NEWS 

What's new in this fast- 


92 


AUDIO UPDATE 

Format future shock. 


110 Advertising Index 




changing field. 




Larry Klein 


101 Buyer's Market 




David Lachenbruch 












95 


DRAWING BOARD 


4 Editorial 


22 


EQUIPMENT REPORT 




Video scrambling. 


16 Letters 








Robert Grossblatt 




Beckman Industrial DMlOXL 








DMM 


97 


COMPUTER 


33 New Lit 


85 


HARDWARE HACKER 




CONNECTIONS 


24 New Products 




Apple's PhotoGrade, and 




The Cheshire Cat, multimedia, 


12 Q&A 




more. 




and vision. 






Don Lancaster 




Jeff Holtzman 


6 What's News 



I 

I 

m 



f 




Si 



III 

I 

CO 



c 
9 
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One of the latest electronic buzz- 
words is "digital signal processing" 
or DSR We're not surprised to Kear 
so much talk about it. DSP is being 
used in everything from compact 
disc players, to weather satellites, 
to the retrieval of photographs from 
NASAspace missions. If you're curi- 
ous about DSP technology, turn to 
page 37. OurVFX Digital Processors 
lets you take a hands-on approach to 
an exciting new technology, and 
have some fun while you're at it. The 
VFX (voice effects) processor uses 
DSP techniques to alter the pitch of 
your voice, or to produce reverb and 
echo effects. It's much less expen- 
sive than any commercially avail- 
able DSP product, and you'll learn 
about the technology as you build 
and use it. 




mMm 




THE OCTOBER ISSUE 
GOES ON SALE 
SEPTEMBER 3. 

BUfLD A HIGH-EFFICIENCY FM HANDI-TALKIE 

This small, light-weight transceiver is powerful and efficient, 

offers narrow-band FM modulation and 

can be designed to operate anywhere from 27 to 32 mHz. 

BUILD A 60-Hz POWER INVERTER 

It will provide over 200 watts to your line-powered devices. 

DESIGNING HIGH-POWER, LOW-DISTORTION AMPLIFIERS 
Real- world applications from a simple 20-watt composite 
amplifier to a 70-watt bridge amp. 

DIFFERENTIAL TEST PROBES 

How and why to use a differential probe. 

M a ftrvfco to r«&dor3, ELECTf^NICS UCM publishes available plans or informatian mlatjng to nnvsworthy products^ 
tachnlquas and ftciantific and tachnological devaropmanLs. Becausa pf poasibla variancea in thft quality and condition of 
materials aad workn^anstiip used by readers , ELECTRONICS NCW cfisclaims any rasponsibillty For Ihs aafa and proper 

functioning of raadar-built projacta basad upon or front plans or infonration published in thi( magazine. 

Since soma of the equipment and circuitry deacrtbed in EL-ECTRONICS NCW may Telete to or be ciTverad by U.S. patents, 
ElECTRONlt^ HON disclaims any liability For tho infringement of sucfl patents by the making, using. oraaUing of any such 
equipment or circuitry, and euggea^ that anyone Interaatad in auoh projeclfi consuk a patent allomey. 

ELECmONICS NOV. aSSN 0033-7aei) September 1M2. Published monthly byCemabacli Publications, Inc.. 500-B BlCountv 
Boulevard. Farmingdala, F4Y 1t735. Second-Class Postage paid at Farmingdate. fJV and additional mailing oFFicas. Second- 
CEaas mail registration No. R12516€280, authorized ai Toronto, Canada. One-year subscription rate USA. and possessions 
S19-97, Canada $17.79 (includes G S.T Canadian Goods and Services Tai Ftegittiatlon No. Fil25166280), all other countries 
$28.97. All subscription orders payable In U.S.A. Funds only, via international postal money order or checli drawn on a U.SJ^. 
bank. Single copiae S2-B5- c 1992 byGemsback Publications. Inc. All right* rveerved. Printed in li.S.A. 

POSTMASTER : Please send address changes to ELECTRON ICS NOW, Subscription Dept.,8oiSSItS,Bouldar, CO B032 1 -5t 1 S. 

Aatamped selF- addressed envelope must accompany aUaubmitted manuscripts and/or artwork or photographs if ttveirretum is 
desired should they be rejected. We disclaim any responsibility for the loss or damaga of manuscripts and/or artwork or 
photographs while in our possession or otherwise. 



Bectnms 



HugoGsmsback CI BB4-1 967) foundar 

Larry Steeklar. EHF. CET. 
edttor-in- chief and publisher 

EDITORIAL DEPARTMENT 
Brian C. Fenton, editor 
Marc Spiwak. associate edrtor 
Nail Scfater, associate editor 
Teri Scadirto, assistant editor 
J«ffray K. Hottzman 
computer editor 

Rob*rt Grossblatt, circuits edttor 
Larry Kisin, audio editor 
Oavid Lachnnbruch 

contributing eijtior 
Don Lancaatar 

contributing editor 

Kattiy T«r«nxir editorial assistant 

ART DEPARTMENT 
Andr* Duxantr art director 
Injaa L««, iltustralor 
Russsll C> Truelson, illustrator 

PRODUCTION DEPARTMENT 
Ruby M. Ysa, production director 
Karan S. BroHti 

advertising produtrtion 
Marcalla Amoroaa 

production assi Stan t 
Lisa Rschowttz 

editorial production 

CIRCULATION DEPARTMENT 
Jacquelinfl P« Ch««saboro 

circulation director 
Wandy Alanho 

circulation anal yst 
TharettB Lombardo 

circulation assistant 
Mlch«la Torrlllo, 

reprint boobitora 

Typography by Mates Graphics 
Cover photo by Diversified Photo 
Sarvlces 

Elactrontca Nomt is indeisd in 
Appfied SciancB A Technology tndffx 
and Readers Guida to Poriodical Uifr- 
abirs. 

Microfilm & Microfiche editions are 
available- Contact circulation depart- 
ment for details. 

Advsrtiatng Salas Offlcas Itated 
<MT paga 102. 

Electronics Now Exei:utive attd 

Administrative Offices 

1-51B-293-30O0. 
Subscriber Customer Service: 

1-800-288-0692. 
Order Entry for New Subscribers: 

1-800-009-7139. 



>6 

AuiJit Bureau 

of Circulations 

Member 




5 WAYS TO STOP 

WASTING TIME IN 

ELECTRONICS. 







2. 



stop wasting your 
'. ,- time soldering. Save 
y/ hours of soldering, 
•" desoldering, resoldering 
with Quick Test'" sockets 
and bus strips. Connect/ 
disconnect resistors, capac- 
itors, transistors, ICs, etc. as 
fast as you can push in/pull 
out leads. Interlock for limit- 
Jess expandability. Priced as 
low as $1.60, you'll wonder 
how you've done without 
them! 



Stop wasting 

your time 

breadboard- 

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Finally, PB-103, with 2,250 contact 
points, and up to 24 1 6-pin capacity 
They're affordable, American-made, 
lifetime guaranteed. You'll soon see 
why PROTO BOARD Brand is 
Today's Standard 
for Quality in 
Breadboarding. 

~ Stop wasting your 

time jury-rigging 
large numbers of circuits. Here are two oversized 
PROTO BOARDS Brand, with expanded area, tie 
points, and more to keep your ideas together. PB- 
104 features 3,060 tie points, which can handle to 32 
16-pin ICs with ease. Four color coded binding 
posts, and roomy 9.2" x 8" metal panel make it 
big. ..but simple. The humungous PB-105 lets you 
load up to 48 16-pin iCs, and much more onto its 



5-color coded 
binding posts 
and 17 
sockets, for 
over 4,560 
contact 
points. 
Lifetime 
guarantee 
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Affordabiy priced 





4. 



Stop wasting your 
timeplugging- 
in external power. 

We've added the 
power to the breadboard. And, 
what power! Up to triple voltage 
power, +5V, +12V, -12V, reg- 
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Up to 2,250 tie points, with 24 tC 
capacity and 14 pin DIPs. Now you 
can create, test and modify TTL, CMOS, 
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there is the standard Global Lifetime Guarantee on 
the sockets. And, wait 'til you see the modest prices! 



iRD Brand is 

3. 



PROTO 



BRAND 



5.«8B«1 






Stop wasting time designing 
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use your solderless breadboard 
concepts for designing accessory 
circuits. PROTOCARD® is a PROTO 
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slot in your IBM, PC/XT or PC/AT computer Some 
modules even include built-in basic decoder circuits 
for memory and I/O addressing. Breadboard areas up 
to 3,360 contact points. Buffered versions eliminate 
loading of pc buses. 




m 

(D 




Call toll-free for details I^LODAL 

1-800-572-1028 SPECIALTIES 



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CIRCLE 1Sa ON FREE INFORMATION CARD 



Global Speciailies. An Inlerplex Electronics Company. 
70 Fulton Terrace. New Haven, CT 06512, 
Telephone: {203J 624.3103. ■<■ Interplex Electronics 1969. 
All Global Speciallies breadboarding prodjcis made in USA. 

AOOll 



EDITORIAL 



NOW'S THE TIME 



Now, according to Webster's New World Dictionary, means "at the 
present time; at this moment." Electronics Now is just what its 
name implies: a compilation of what is happening in electronics at 
this moment! 

Electronics Now brings you the latest news, the newest products, 
the most useful training, the most exciting projects, the newest 
how-to information. We help you learn how it works, how to keep it 
working, and, of course, how to make your own. We even show 
you what may happen tomorrow. 

Above all else, we remain your electronics magazine. We know 
that the great majority (89%) of you earn your living in electronics. 
But you are the engineers and technicians to whom being an 
electronics professional is more than just a job. In your spare 
time — your leisure time — your personal time — you still want to 
know and learn more about electronics. 

You want to know how Caller ID works. You want to know how 
digital audio tape compares to digital connpact cassettes. You need 
to know about cellular telephone services and the personal 
communication networks of tomorrow. You need to know what 
microprocessor your next computer will have. You have to know 
what the next generation IC's will be like. 

Bringing you information on those and other subjects is our forte. 
We work and strive to stay on top, to learn, to explore, and follow 
late-breaking developments in electronics. And we do it nowl 
That's where our new name — Electronics Now — comes from. 
That's what we bring to you — today and tomorrow — 
Electronics Now! 

Stay with us as we evolve and grow to meet the ever growing 
challenge of the electronics revolution. Stay with us as we continue 
our quest for the most exciting, most revolutionary, and most 
daring developments of today and tomorrow. Become, through our 
pages, a part of the most important and influential segment of our 
modern world. Come with us as we become Electronics Now. 



/7i^^^^ j^Cuidt^ 




Larry Stockier, EHF/CET 
Editor-in-Chief and Publisher 



Take this GIANT Handbook 
for only $9.95 

when you join the Electronics Engineers' Booi< Club 



ELECTRONICS ENGINEERS' 
HANDBOOK, Third Edition 

Edited by D.G. Fink 
and D. Christiansen 

Completely revised, expanded, and updated, 
this third edition of the desktop reference is 
widely considered the definitive work in its field, 
covering all aspects of today's electronics 
engineering. Written and compiled by more than 
1 70 experts, this giant handbook shows you 
how to use the latest design and cost-cutting 
solutions at work in the industry today. You'll 
find a wealth of new material on electronic 
systems design, computer systems and digital 
recording, telecommunications, process control, 
laser technology, and CAD of electronic circuits. 
It deals with the full range of theory and prac- 
tice, covering essential principles, data, devices, 
components, assemblies, circuits, functions, and 
applications. 



2,624 pages 1 ,800 illustrations Book No. 9255H Hardcover 

n coupon is missing, writ« lo: EtecEfonics Engineers' Book Club, Gtue Ridge Sumcnil, PA 17^94-0360 




As a member of the 
Electronics Engineers' 
Book Glub . . . 

. . . you'll enjoy receiving Club bulletins every 3-4 
weeks containing exciting offers on the latest 
books in the field at savings of up to 50% off of 
regular publishers' prices. If you want the Main 
Selection do nothing and it will be shipped 
automatically. If you want another book, or no 
book at all, simply return the reply form to us by 
the date specified. You'll always have at least 
10 days to decide. Your only obligation is to 
purchase 3 more books during the next 2 years, 
after whichi you may cancel your membership 

at any time. Publlshwa' p^Iom >hown. iQ19« EEBC 



ELECTBOWfCS EnG IHEERS' 

^^^^^^^t^^^^^t^m^ BOOK CUUB ^ 
BluB Ridga Summit. PA 17294-OSSO 

DYES! Please send me Electronics Engineers' Handbook, 3rci Ed. 
(9255H), billing me $9.95 plus shipping/handling & tax. Enroll me as a 
member of the Electronics Engineers' Book Club according to the terms 
outlined in this ad. If not satisfied, I may return tfie book within 10 days 
and have my membership cancelled. A shipping/handling charge & sales 
tax will be added to ail orders. 



Name 



S 
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!!1 

CO 



Address _ 
City/state 



. Phone 



2iP— 

Valid for new membdrs only, subj&ct to acceptance by EEBC, Canada mi/jtf remit in U.5, funds. 
App3ioartt$ outside the U-S- anij Canada will recaiva spaciat ordarlns instructions. FIPIF99£ 




MM 



A review of the latest happenings in electronics. 




World's smallest hard-disk 
drive 

Hewlett-Packard Company intro-' 
duced the world's smallest hard- 
disk drive in June. Its 1.3-inch Kitty- 
haiwk Personal Storage Module can 
store up to 21 .4 megabytes of data 
Cformatted), The introduction of the 
matchbox-size drive by HP, not 
known for its expertise in that tech- 
nology, seems to assure continued 
life forrDtating disk memories. HP's 
development makes it highly un- 
likely that disk drives will be driven 
out of the market by semiconductor 
memory modules in the forseeable 
future. 

The drive was developed for 
palmtop, pen-based and sub note- 
book-size computers whose man- 
ufacturers are continually seeking 
component size, weight, and power 
reductions. The disk drive package 
measures 0.4 inch x 2 inches x 
1.44 inches, and it weighs about 
one ounce. The platters rotate at 
5400 rpm, and average seek time is 
less than 18 milliseconds. 

HP says the drive — which will be 
priced at $250 in high volume — is 
far more resistant to shock than the 
1.8-inch and 2.4-inch drives now 
available, in addition to applications 
in existing products, HP predicts 
that Kittyhawk will find a place in 
such future products as printers, fax 
machines, medical equipment, 
communications gear, and digital 
imagers. Company officials even 
see a place for it in consumer video- 
game cartridges and as data stor- 
age media for cellular telephones 
and digital copiers. 

The sub-mini disk drive was de- 
veloped in cooperation with several 
companies including AT&T Micro- 
electronics (Berkeley Heights, NJ) 
and Citizen Watch Co., Ltd., of 
Japan. Working with AT&T Micro- 
electronics, HP was able to reduce 
the 20 to 30 IC's typical of most of 
today's 1.8- and 2.5-inch drives to 
just seven. 

According to HP, the cost of 
semiconductor memory equivalent 




HEWLETT-PACKARD'S 1.3-INCH DRIVE 
shown here actual size. 

to the capacity of the Kittyhawk is 
about five times the price of the 
drive — and that is before the learn- 
ing curve price reductions have 
taken effect. Twenty megabytes of 
semiconductor memory now has an 
OEM price of about $1 000 C$50 per 
Mbyte); by comparison, at Kit- 
tyhawk 's present OEM prices, the 
cost of memory is $12 per Mbyte. 
The drive module stores data like 
a standard Winchester drive, and it 
connects with a Personal Computer 
Memory Card International Associ- 
ation (PCMCIA) or standard AT in- 
terface. The 21.4-Mbyte drive has 
two platters and three heads. The 
modules contain a sensor that de- 
tects impact and causes them to 
shift to a self-protective mode to 
preserve data. 

Advanced MRI technique 

Advanced magnetic resonance 
imaging CMRD now permits the 
measurement of the flexibility of 
blood vessels, a key predictor of 
heart disease. Scientists at GE Re- 
search and Development Center 
(Schenectady, NY), working closely 
with researchers from the Imperial 
College of Science, Technology 
and Medicine (London, U.K), have 
developed a non-invasive technique 



based on MRI technology that si- 
multaneously determines blood- 
flow velocities at different points 
along a blood vessel. 

The measurements obtained can 
then be used to calculate the speed 
at which a pressure pulse travels 
away from the heart and down a 
vessel after the heart contracts. 
Those wave propagation speeds 
permit the computation of vessel- 
wall flexibility, a factor in the deter- 
mination of the presence of dis- 
eases such as atherosclerosis. 

GE's MRI technique is expected 
to be able to follow changes in 
blood-vessel flexibility as people 
age or as diseases develop. Be- 
cause it relies on MRI angiogra- 
phy.there is no need to insert a 
pressure transducer on the end of a 
catheter that must be snaked 
through the arteries, a potentially 
dangerous invasive pracess. 




A BLOOD-FLOW VELOCITY 
measurement made with an MRt 
imaging technique is studied by GE 
scientists Charles Dumoulin and 
Robert Darrow. 

In MRI inspection of internal 
organs and tissues is done with a 
combination of powerful magnetic 
field, radio-frequency emissions 
and computer computation. A su- 
perconducting magnet within the 
barrel-shaped MRI equipment can 
produce a 1.5 Tesia field within its 
one-meter bore where the patient is 
located. 

The patient within the bore is 
continued on page 21 



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VIDEO NEWS 



What's new in the fast-changing video industry. 



OAV m LACHENBRUCH 



• Flat panels for HDTV. There s 
still no substitute for the CRT when 
it comes to large-screen resolution, 
but that doesn't mean that de- 
velopers around the world aren't still 
trying to find that elusive giant pic- 
ture on the wall for HDTV. Two 
promising developments recently 
surfaced in Japan. 

Flat plasma display. The pres- 
tigious Japan Broadcasting Corpo- 
ration CNHK), Japan's public-televi- 
sion broadcaster, recently held an 
impressive progress-report demon- 
stration of a thin glass sandwich 
HDTV plasma display pane! that it 
says could be commercialized as 
soon as 1997. The system is being 
developed as a joint effort with Mat- 
sushita (F^nasonic), NEC. Oki Elec- 
tric, and Dai Nippon Printing. Texas 
Instruments has a contract to de- 
velop semiconductors for the sys- 
tem. NHK is now demonstrating a 
working model HDTV display panel 
with a 16:9 widescreen aspect ratio, 
the model is three inches thick and 
weighs less than 18 pounds. 

NHK concedes that there's more 
work to do, but thinks the answers 
to the remaining problems are in 
sight. The screen has 1344 display 
cells horizontally and 800 vertically, 
for a resolution of 1,075,000 pixels, 
but it still falls short of the neces- 
sary brightness and life for a con- 
sumer display. The final version will 
have smaller cell size. NHK is prc»m- 
ising to show a 55-inch wori^ing pro- 
totype next year 

Fermelectric LCD. Working with 
a technology that others have re- 
jected. Canon of Japan believes 
that it has found the solution to the 
need for giant thin color screens 
with no flicker and with a wide dis- 
play angle for digital HDTV. While 
others work with the frustratingly 
difficult problems of active matrix 
LCD's, Canon has chosen to gam- 
ble on ferroelectric LCD CFELCD), a 
technology known since 1974. Can- 
on is already planning to build sev- 
eral plants to mass-produce con- 
sumer HDTV panels. 



Canon scientists believe that 
there is no theoretical limit to the 
size of FELCD screens. FELCD ma- 
terial differs from active matrix LCD 
transistors in that it's bi-stable — it 
can only be switched off or on. 
Once switched on, an FELCD mole- 
cule remains on until turned off, and 
vice versa. That would make it ide- 
ally suited to digital TV transmission 
if the problem of color rendition and 
gray scale could be solved. Canon 
says it has done this by calling on its 
work in black-and-white and color 
printers. 

Canon says that it will start mak- 
ing computer monitors using the 
FELCD material next year, moving 
to color in 1994. The company al- 
ready has displayed a still color 
screen with neady HDTV resolu- 
tion — four times better than com- 
puter VGA color CRT monitors. The 
planned 15-inch computer display 
has a resolution of 1 280 x 1024 pix- 
els, and the proposed 16:9 HDTV 
display is scheduled to have 1920 
pixels in each of 1152 horizontal 
lines. 

• Widescreen sets in tlie U.S. 

Thomson Consumer Electronics 
continues to dole out information 
about its widescreen 16:9 aspect 
ratio TV sets just a little at a time. 
The first sets, due out late this year 
under the RCA and FVoScan labels, 
will have 34-inch picture tubes made 
in Thomson's tube plant in Italy. The 
company is shooting for a price of 
$4000-$5000 for the first sets, 
less than the price tags for Thom- 
son widescreen sets that are al- 
ready available in Euncpe. However 
Thomson plans to start manufactur- 
ing widescreen tubes in the U.S. in 
1994. and its goal for that time is a 
34-inch widescreen set at about the 
price of today's 35-inch standard as- 
pect ration (4:3) sets, which now 
start at less than $2000, In addition 
to the 34-inch direct-view set, 
Thomson plans to offer widescreen 
projection sets in larger sizes begin- 
ning next year 



• Hughes-JVC projection 
pact. Hughes Aircraft, which has 
manufactured multi-million dollar 
video projectors for the Pentagon, 
is gearing up for civilian production. 
Hughes has been seeking a con- 
sumer-electronics partner to de- 
velop a consumer version of its 
liquid-crystal lightvalve CLCLV) proj- 
ection system. It finally found that 
partner in Japan's JVC. Hughes- 
JVC Technology Coip., 60% owned 
by Hughes and 40% by JVC, will 
develop consumer and commercial 
versions of LCLV projectors. The 
system combines a high-resolution 
CRT for image generation with sep- 
arate LCD panels and an external 
light source to provide a very bright 
picture with high resolution. It is a 
candidate for future giant-screen 
HDTV projection sets. 

This fall, Hughes-JVC will market 
professional models already de- 
veloped by Hughes, priced from 
$8000 to more than a million dol- 
lars; consumer versions will cost 
from $2000 to $7000. JVC will 
manufacture consumer projectors 
and key components in Japan, and 
will distribute LCLV projectors 
worldwide through its sales net- 
work, Hughes said that HDTV reso- 
lution has been achieved with LCLV 
pnsjectors, and 35mm-film resolu- 
tion is the next target it will be 
shooting for 

• 8mm video decks here. The 

success of the 8mm video format in 
camcorders must be followed by 
decks for showing and editing home 
videos. Sony vras the only source 
8mm decks, but two others have 
appeared. The compact decks with 
hi-fi stereo sound, which carry the 
RCA and Samsung brand names, 
are expected to sell for about $499. 
They're both made by Korea's Sam- 
sung. In the future is a dual-well 
8mmA/HS deck to transfer 8mm 
videos to VHS cassettes and for 
editing home videos. Go-Video has 
already shown a prototype model, 
due next year R-E 



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12 



DOUBLE AND HIGH DENSITY 

Is there any truth to the rumor 
I've heard that the only dif- 
ference between 3Vz-inch dou- 
ble- and high-density disks is 
ttie extra hole in the corner of 
ttie plastic package? Just about 
everybody I know buys the dou- 
ble-density variety and then 
punches a hole in the plastic 
case to turn the disks into high- 
density ones. I've done it myself 
and can't see any difference be- 
tween these disks and the ones 
with "HD" stamped on them. — F. 
Foeg, Frish, CA 

This is one of those times when I 
have to say that your guess is as 
good as mine. I've done the same 
thing to double-density disks and 
have never had a problem either. I 
know people who swear they're dif- 
ferent but I've never had a practical 
example of it. 

I remember reading a long de- 
scription of the chemical difference 
in the media but it seems to have 
made little impression on me since 
all I remember is that the article was 
long and technical — the details have 
disappeared completely from my 
mind. 

From a practical point of view, I've 
had more trouble with "real" high- 
density 3'/2-inch disks than with the 
ones I've punched or drilled into ex- 
istence. This is just as true for 
name-brand disks as it is for the 
generic (and cheaper) variety. 

Just about the only piece of hard 
information I have for you is the fact 
that some older high-density SVz- 
inch disk drives don't have the LED 
and sensor setup to look for the 
extra hole. Those drives are usually 
found on the older PS2 computers 
from IBM. 

I know that this letter — and the 
answer — will spark a host of mail 
from people who are into disk media 
chemistry. That may be a good thing 
because this rumor about 3'/2-incli 
disks has been floating around 
since the high-density variety first 




FIG.1— A SECOND HOLE INDICATES 
that a disk is high-density. 

came on the market. If people out 
there really have the answer, and the 
credentials to back it up, I look for- 
ward to hearing from them and I'll be 
sure to pass the "real" information 
along. 

THE APPLE FAMILY 
Tm thinking about buying a 
used Apple lie for my son since 
there are some good buys 
around, but I'm not sure about 
the difference between these 
computers and the other mem- 
bers of the Apple family. Also, 
I'd like to know if I can use my 
color TV for a monitor or will 
everything be unreadable? — S. 
Gibbs, Redondo Beach, CA 

Apple isn't what Apple once was. 
It's sad but true that while Apple 
made a lot of money with the Apple 
II series by saturation selling in the 
educational market (mostly grade 
schools), they seemed to have 
shifted their corporate focus to the 
Macintosh. While there are some 
similarities between all the mem- 
bers of the Apple II family, they are a 
completely different breed frcim the 
Macintosh. 

Once upon a time, Apple II com- 
puters were targeted mostly at the 
schools and the Macintoshes were 
aimed at the graphic arts, but this 
seems to have changed. Apple has 
reduced the amount of corporate 
resources devoted to the Apple II 
and has been touting the Macintosh 



as an alternative to IBM compati- 
bles In the business worid. 

To answer your first question 
more specifically there's a big dif- 
ference between the Apple lie and 
the Apple llgs. The "e" stands for 
"enhanced" to highlight the dif- 
ference between It and the older 
Apple 11+ it replaced. The "gs" 
stands for "graphics/sound" and is 
a way of emphasizing the diffensnce 
between It and the older Apple lie 
you're thinking of buying. 

While the Apple llgs can run a lot 
of the software written for the Apple 
lie, the reverse Isn't true at all. The 
hardware is very different and so are 
the capabilities of the two ma- 
chines. If you have some specific 
software in mind, a used Apple He 
can be a good buy but, if you're sold 
on the idea of having one of the 
Apple II series of computers, spring 
for the extra bucks and hunt up a 
used Apple llgs. 

It may interest you to know that 
friends of mine who teach the com- 
puter courses In grade schools tell 
me that it's getting harder and hard- 
er to find new software for the Apple 
II computers — even for the top of 
the line Apple llgs. You should 
check with people In the schools 
near you and find out for yourself 
since even the world's greatest 
computer tsn 't worth anything if the 
larger software companies are with- 
drawing their support. Remember 
these people are market driven and 
they may know something we don't. 
It's not always wise to rely com- 
pletely on the advice of the sales- 
men In the Apple stores. They make 
their money selling computers, not 
writing the software that will run on 
them. 

As far as using a TV is concerned, 
it might be OK for games but if you 
want to do anything more serious, 
you'll find it entirely unsuitable. You 
might save some money by not buy- 
ing a real monitor but it's a safe bet 
that all those savings will go into eye 
exams and new glasses. 



4 




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VIDEO IC'S 

I'm interested in building 
some video devices but I'm hav- 
ing a hard time locating tKe IC's 
that are best suited to the cir- 
cuits I have in mind. Do you have 
any supplier that specializes in 
carrying these chips? — M. 
Brown, London, UK 

I sympathize with you because 
I've frequently run into the same 
problem myself. It's a hard and fast 
rule that the mone specialized the 
IC, the harder it is to find — es- 
pecially in single quantities and with- 
out having to meet any minimum 
order. 

The best place to begin your hunt 
for these parts is with the very peo- 
ple who make thenn — the IC man- 
ufacturers. If you're lucky, you'll be 
able to get some freebie"engineer- 
ing samples" from them. This is only 
true if you get the right person on 
the phone and you identify yourself 
in such a way as to let them think it's 
worth their while to send you the 
stuff you want. 

Remember, they're in the busi- 
ness of making chips for sale and if 
they believe that a small sample now 
can lead to a large order later on, 
you'll get what you need. 

A second line of approach is to 
find out who their distributors are in 
your area and trying the same line 
with them. Your chances aren't as 
good with a distributor, but you nev- 
er know. The salesperson might let 
you pay for a few parts (and ship- 
ping), without having to meet their 
minimum order quantity. 

The last alternative — although 
you might not like it — is to fill out the 
minimum order by stocking up on 
parts you'll be able to use later on. 
This means stuff that may be 
needed for something else you have 
In mind but don't intend to actually 
start for a while. 

Getting anything in single quan- 
tities is the hardest thing an experi- 
menter can do. There are, however, 
suppliers who stock a wide variety 
of components and low or no mini- 
mum orders. 

SPEEDING CURSOR 

I recently upgraded from my 

old XT computer and got a much 

faster 386SX that runs at 20 

MHz. Everything runs much 



faster now, but 1 find that the cur- 
sor speed hasn't changed 
much. Is there anything I can do 
about this because speeding up 
the cursor will make my new 
computer seem to run even fast- 
er.— B. Geoff, Fischer, IN 

Although your expectations 
haven't quite been met, I guarantee 
that making such a major change in 
your computer horsepower has also 
made a change in the speed of your 
cursor The reason you haven't seen 
as much of a change as you would 
like is simply that the speed of the 
cursor is dependent on three sepa- 
rate factors: 

• Basic computer speed 

• Basic video speed 

• Basic keyboard speed 

and all you've done is changed one 
of these factors. 

Now that you have a computer 
that runs at a furious rate of speed, 
the cursor speed is being limited by 
the speed of either your video 
adapter or your keyboard — which- 
ever is less. 

Remember that when the key- 
board sends an instruction to move 
the cursor, the computer telts the 
video adapter to do it. The comput- 
er does its part of the job pretty 
quickly, but the other hA/o compo- 
nents operate much more slowly— 
particularly the keyboard. 

However it's a good thing that the 
keyboard is the slowest component 
because the keyboard rBpeat rate 
can be changed with software. 
(There isn't much you can do about 
the speed of your video adapter, 
short of spending a lot of money for 
fast video card.) 

There are several public domain 
programs (and some commercial 
ones as well) for changing the key- 
board repeat rate, but all of them 
have one slight disadvantage: they 
steal a certain amount, however lit- 
tle, of valuable memory. That can be 
a really big problem. 

The answer is a small public do- 
main program called FAST.COM 
that cuts the keyboard repeat delay 
to a bare minimum. I've been using it 
for several years without any trou- 
ble, and I njn it automatically every 
time I turn on my computer I've put 
it on the RE-BBS (516-293-2283, 
1200/2400, 8N1) so you can down- 
load it and see if it works. R-E 



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n BPZ48 — TEST 
EQUIPMENT CON- 
STRUCTION 

$5.95. Details con. 
struclion of simple, in- 
expensive, but ex- 
tremely useful test 
equipment. AF Gen, 
Test Bencli Ampl. Au- 
dio Milllvoltineter. Tran- 
sistor Tester and sk 



TmEgunaiwn 
CMAuaaen 




H 





n CM0S1— CMOS POCKET GUIDE 1 

$16.95. Works like Ihe TTL Gufdes hu! covers 
all oimmofily used CMOS standard devices. 
Siix ma^r sections. The first shows the device 
schematic Neitt is a brief description of ifie 
componeni and is followed by full operating 
details. The fourth s^ciion Itsls major a.ppiica- 
tEons. while the 5th and 6th sections present 
essential dala lor thai devtce and a li$t of the 
neleveni maniifacturers. The linal two sections 
are a valuable cross-reference. 




nBP267— HOW TO 
USE OSCILLO- 
SCOPES AND 
OTHER TEST EQUIP- 
MENT S6.95.Mas- 

ienng the osdiloscxipe 
is not really loo difficuH 
This book explains all 
Ihe standard controls 
and functions. Other 
pqulpment is ^so de- 
scribed. 



n BP265— MORE 
ADVANCED USES 
OF THE MULTI- 
METER $5.95. Use 

these techniques to 
test and analyze Ihe 
performafK® of a vari- 
ety ot components. 
Also see how to build 
ad-ons to extend mutti- 
meter capabilities. 





J1 n BP2S6— INTRO TO 
— i LOUDSPEAKERS 
•^ AND ENCLOSURE 

DESrON S5.95.Wfe 

explore the variety of 
endosu re and speaker 
designs i n use today, so 
the rea<ier can under- 
stand the pnnciples jn^ 
voEved. 



n BP299— PRACTICAL 
ELECTRONIC FILTERS 
. $6.$5. fYesents a doz- 
en liJter-based practical 
projects with applications in 
and around the horne or in 
the constructor's worf<shop. 
Comptete constnjction de- 
talEs are included. 




n BP249— MORE 
ADVANCED TEST 
EQUIPMENT CON- 
STRUCTION 

$fi.95. Eleven more 
lest equipment con- 
struction projects. 
They include a digital 
TOltmeter, capacitance 
meter, current tracer 
and more. 




DUWAUdkl 




n BP245— DIGITAL 
AUDIO PROJECTS 
SS.as. Practical cir- 
cuits to build and ex- 
pertmenl with In 
eludes AD converter, 
input ampiiner, digital 
delay linig, compar>der. 
echo effect ajxl ntore. 



D BP303~UNDERSTAND(NG 

PC SOFTWARE $6.95. This 

book wilt help you understand the 
basics of various types of business 
software m common use. Types d 
software covered include word pro- 
cessors, spelling checkers, graph- 
ics programs, desktop publishing, 
databases, spreadsheets and util- 
ities. 



n BP247— MORE 
ADVANCED MIOI 

PROJECTS S5.S5. 

Circuits Included are a 
MID] indicator, THRU 
box, merge unit, code 
generator, pedal, pro- 
grammer channelizer, 
and analyzer 




n BP257--INTRO TO 

AMATEUR RADtO 

S6,95, Amateur Is a 
unique and fascinating 
hobby. This book gives 
the newcomer a com- 
prehensive and easy to 
understand guide to 
the subject. 




n BP309— PREAMPLI- 
FIER AND FILTEI^ CIR- 

COrrS S6.95. provides 

circuits and background 
info for a range of pre- 
arnplifjers. plus tone con- 
trols, filters, mixers and 
more, Ail are high-perfor- 
mance drcuiis thai can be 
built at a reasonable cost. 




naP£51— COMPUT- 
ER HOBBVISTS 

HANDBOOK 

$&.95. A wrapup of ev- 
erything ^e computer 
hobbyist needs to 
know in one easy to 
use volume. Pitrvjdes a 
range of useful reler- 
ence material in a sin- 
gle source. 




n PCP115— ELECTRONIC 
PROJECTS FOR HOME SECUR- 
ITY $10.00. 25 projects ranging 

from a single-door protection cir- 
cuit that can be completed in an 
hour or two, to a sophisticated 
muHi'Channel security system. 
Each project is described in detail 
with circuit diagrams, explanations 
ol how it works, inslruclions for 
building and toting, and how to 
adapt circuits to meet special re- 
quirements. 



D BP19S— iNTROOUCTIOM TO SATELLITE TV..... $9.M. A definitive inttoducfkin to 
the subject written fcx the pcoles&HXiaJ engineef, etecbonk^ enthusiast. 6r others 
who want to know more before they buy. 6 x ^0 in. 

[2 BPt90— ADVANCED ELECTRONK: SECURITY PR0JECTS,..^^>»5, Includes 3 
passive infra-red detector, a fiber-optic loop alarm, computer-based alarms and an 
unusual lorm of ultrasonic intruder detector. 

D BP235— POWER SELECTOR GUIDE^.^.^O^OO. Complete guide to semiconduc- 
tor power devices. Mo^ than 1000 power harvlting devkxs are irK:lu6ed. They are 
tabulated in abpha-numenc sequency, by technical specs. Includes p^Twer diodes, 
ThynslOrs, Tnacs, Power TransiStOfS arKJ FETi. 

D BP234— TR ANSI STOR SELECTOR GUIDE $10.00. Companion volume to 

BP235. Book covers more than HOO JEDEC, JIS. and brand- specific devices Also 
contains listing by case type, ^nd electronic parameters. Includes Darlirviton 
transistors, high-voliage devices, high-cunent devices, high power devk:es. 

D BP99 MINI MATRIX BOARD PROJECTS $5.50. Hete are 20 useful circuHs 

trim can be buin on a mini-malrix board that is just 24 botes by ten copper-loii strifB . 

P 8P11T— PRACTICAL ELECTRONIC BUILDING BLOCKS— Book I $5.75. 

OsGllatofs. Timers, Noise Gerwrators. Rectifiers. Comparators. Triggefs and mow. 

D BP1B4— tNTRO TO 68000 ASSEMBLY LANGUAGE $«,95, The 68000 is a 

gieed new breed o4 microprocessor. Programming in astsembly language increases 
the running speed of your programs. Here^ what you need to knew. 



n BP179— ELECTRONIC CIRCUITS 
FOR THE COMPUTER CONTROL OF 
ROBOTS -". $7,50. Data and circuits for 
interfacing the computer to the robots 
mdors and sensors. 




CHECK OFF 
THE BOOKS YOU WANT 



D BP239— GETTING THE MOST FROM YOUR MULTIMETER $5.95. Covers 

basics of anakig and d^tal meters. Methods of component testing includes 
transfers. Ihyrislors, resistors, capacitors and ether active and passive deviceS- 

D SP97— IC PROJECTS FOR BEGINNERS $5.50, Power supplies, radio and 

audio circuits, oscillators, timers, swilcfies, and more. If you can use a soldering iron 
you can build ttiese devices, 

O BP37— 50 PfKXfECTS USING RELAYS, Sf^R S « 1T1IACS tSM^ BuikJ pri- 
ority indk^ors, tight nxjdulators, warning dev>ces, tight dummers ar>d more. 



n RADIO— 100 RADIO HOOKUPS $3.00. Fteprint of ^92i booklet presents radki 

circuits of the era including regenerative, neutrodyne, reflex & more. 



D BP42-'SIMPLE LED CIRCUITS $5.50. A large selection o< Simple appticalions 

lor this sjmple electronic simponent. 



D BP122— AUDK> AMPLIFIER CONSTRUCTION $5.75. Construction details lor 

pfwamps and power amplifiers up through a 100-watt OC-coupted FED amplifier. 



n BP92—CRYSTAL SET CONSTRUCTION.... $5.50. Everything you need to know 
about building crystal radio receivers. 

r; BP2S5— INTERNATIONAL RADIO 

STATIONS GUIDE $7.95. Provides 

the casual listened, amateur radio DXer 

and the professional radio monitor with an 
essential relerence wofk designed to 
guide him or her around than ever more 
complex radio bands. 



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LETTERS 



Write to Letters, Electronics Now, 500-B Bi-County Blvd., Farmingdate, NY 11735 



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16 



SOLID-STATE RELAY UPDATE 

Regarding the article, "Solid- 
State Relay" (Radio-Elec- 
tronics. May 1992). a very impor- 
tant feature is the zero-current 
switch-off characteristic inherent in 
the triac. 

The interruption of the circuit at 
the instant the current is zens avoids 
voltage spikes that could be pro- 
duced by the stored energy (E) in 
the distributed inductance of the 
power line and leakage inductance 
of the nnains (line) transformer (U if 
the current is suddenly interrupted 
at a non-zero value, as occurs with 
mechanical contact breakers. As 
we know, E = V2 Li^. At the instant 
the current crosses zero, the stored 
energy is also zero. 

These voltage transients, which 
are caused by switching heavy cur- 
rents, are often the reason for feilure 
of electronic equipment connected 
to the same line. The solid-state re- 
lay prevents such damage. 
LEO BATISTA 

Professor of Electric Automation 
University of Sao Paulo 
Sao Paulo, Brazil 

A REAL HUM-DINGER 

I appreciated the response to the 
60-hertz hum question that ap- 
peared in Ask RE in the June issue 
of Radio- Electronics. I had the 

same problem with my speaker sys- 
tem. I took your advice, and my 
pPDblems were solved. Thanks! 
JEFF FRUSCELLA 
Kirtland, OH 

ANOTHER HUM STOPPER 

I enjoy reading Ask R-E each 
month. The 60-hertz hum problem 
described in the June issue could 
be caused by a ground loop. When 
components of a stereo system 
that are connected by patch cords 
receive their power from different 
120-volt receptacles, a ground loop 
can be formed by a small amount of 
alternating current flowing in the 
shield of a shielded patch cord. That 



current flow is caused by a small 
potential difference in the neutral 
conductor wiring in a building's 120- 
volt circuits. 

There is help for this type of hum 
problem. Radio Shack has a stereo 
graund-loop isolator. No. 270-054, 
which is a patch cord with two audio 
isolation transformers included. 
Those transformers break the 
ground-loop circuit, thereby stop- 
ping the curiBnt flow that causes the 
hum. 

The ground loop isolator is listed 
on page 60 of Radio Shack's 1992 
catalog in the automotive section. It 
can be used in line- level circuits of 
any audio equipment. I have suc- 
cessfully used this device in audio 
component hookups. 
JACK P. SONNEMAN 
Fayetteville. OH 

ROSiCRUCIANS, ALIVE AND WELL 

I am wnting in response to the 
item in Ask R-E (Radio-Elec- 
tronics, June 1992) about FM an- 
tennas that use household wiring. 
Perhaps they have disappeared, 
which is fine by me, but Rosicru- 
cians (AMORC) haven't. I sub- 
scribe to Radio-Electronics and 
have done so for quite some time. I 
am also a member of the Rosicm- 
cian Order, AMORC, and have been 
a member for just as long, if not 
longer. 

Until the time comes when I no 
longer receive the valued informa- 
tion that I do from both Radio- 
Electronics and AMORC, I will be 
affiliated with both. Your questions 
are welcome. 
CHARLES R. BAILEY 
2123 Grand St. N.E 
Minneapolis, MN 554 18 

TURN-SIGNAL AMPLIFIER 

Regarding the request fram W. 
Baker in Ask R-E (Radio- Elec- 
tronics. April 1992) for a turn-sig- 
nal amplifier, ) have designed a 
simple, low-cost device that is in- 
tended to solve that prciblem. 



The product requires no wiring in 
any vehicle, be it a bus, truck, or 
automobile, and operates with a 
time delay A 2800-Hz beep is gen- 
erated altera fixed-time delay and is 
repeated at this same delay for as 
long as the turn-signal switch is on. 
For example, when the turn-signal 
switch is selected to indicate a turn, 
45 seconds later if the selector 
switch is still on, a 2800-Hz beep is 
emitted. The beep is repeated 45 
seconds later, and will keep occur- 
ring at 45-second inter^ls for as 
long as the turn signal remains on. 
The time delay can be designed for 
any value. Most customers will like- 
ly prefer a 60-second delay, but 
there will be 30-second and 45-sec- 
ond delays available, or any other 
that the market might desire. Two 
volumes of sound are selectable by 
a slide switch. 

The product is simply installed in 
any vehicle in less than two min- 
utes, and will be available from my 
company for less than $20 starting 
in December 1992. 
ALBERT P GREGORY 
A.G. Technologies 
27211 El Pico Lane 
Sun City, CA 92486 

TURN-StGNAL AMPLIFIER 

In April's Ask R-E, your response 
to W. Baker's request for a turn sig- 
nal amplifier — to purchase and add 
a chime — is expensive and gives an 
undesirable indication. The "chime" 
is not something most people wrant 
to hear every time their turn-signal 
lamps flash. Here are two other 
practical solutions. 

Wagner Lighting now markets a 
fully solid-state, two-terminal auto- 
motive flasher. One specification 
that has been an issue since the 
project started is the audio output, 
since there is no bimetallic blade or 
relay to make the sound. An audio 
transducer was added to generate 
the familiar click that drivers associ- 
ate with flashers. 

Because a sotid-state flasher re- 



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Before we built ihe new generation Beckman 
Industrial Series 2000 DMMs, we asked people 
like you what you rea//v want. 

You want more. More test and measurement 
capabilities. More troubleshooting features. All 
in an affordable hand-held DMM. The Series 2000 
features the widest range Frequency Counter in 
any professional DMM, a full-range Capacitance 
Meter, True RMS measurements, Intermittent 
Detection, 50ns Pulse Detection, and Peak 
Measurement capabilities. Plus, the Series 2000 
is the only meter to offer autoranging Min/Max 
recording and relative modes. 

You want a DMM that's easier to use. The 
Series 2O00's display is 25% larger, with bigger 
digits and backlighting for easier reading, even 
in the worst light. Plus the fast 4 digit display 
provides the high resolution needed for adjusting 
power supplies and generators down to ImV. 
And only the Series 2000 features a menuing 
system for fast, simple feaaips access. 




Made in ihe USA 



The Beckman Industrial Series 2000, priced 
from $209 to S279 offers you the best perfor- 
mance for your dollar. Look again at these features; 

• 4 Digit, 10,000 Count Resolution 

• Basic Accuracy to 0.1% 

• Tme RMS, AC or AC on DC 

• O.Olti Resolution 

• Automatic Reading Hold 

• 1ms Peak Hold 

• Fully Autoranging Relative and Min Max Modes 

• Intermittent Detector 

• UL1244, lEClOlO Design 

• "Hire" Year Warranty 

The Series 2000 offers the most solutions for your 
everyday test and measurement needs. The only 
DMMs designed by the people who use them. You. 

For more inforaialion on these new DMMs 
call (outside CA) 1-800-S54-2708 or ^^ , 
(inside CA) 1-800-227-9781. Beckman ^3 M 
Industrial Corporation. 3883 Ruffin Rd.. ^V # 
San Diego, CA 92123-1898, 



Beckman Industrial 

An Aftiliate of Emerson Electric Co. 

CIRCLE 9B ON FREE INFORMATION CARD 



Specinc^tLons subject lo change without notice. 
C Wl Bedknun Industrial Corp, 



quires an external audio transducer, 
Wagner's new flasher has incorpo- 
rated an attention timer that beeps 
for eight flashes after a delay of 
about three minutes. Beeps alert 
the driver that his turn signal flasher 
has been left on. Because this flash- 
er has two terminals, it can replace 
any existing automotive turn-signal 
flasher. 

Another way to get the driver's 
attention is by making the click loud- 
er. A capacitor in series with a 
speaker across the load and battery 
terminal of the flasher will create a 
click at every lamp on/off transition. 
When the flasher turns the lamps 
on, a voltage spike will dissipate 
thnDugh the speaker and create a 
"click. " The same thing will happen 
when the flashertums the lamps off. 
The larger the capacitor and speak- 
er, theloudertheclick. Avalueof 47 
microfarads works well with a I'/a- 
inch speaker 

I've enjoyed Radio-Elec- 
tronics for years and use it to keep 
my design and practical skills up to 
date. Keep up the good work. 



TIMOTHY W. BROOKS 
Senior Design Engineer 
Wagner Lighting 
Seviervitle, TN 

TV AND X RAYS 

I'm writing in regard to the item 
about TV and X-rays that appeared 
in Video News (Radio-Elec- 
tronics, June 1992). I'm aware that 
the changes in modern-day TV 
sets — including solid-state circuitry 
and redesigned shielded CRT's — 
probably make them safer to be 
near than ever. 

However. I'm also aware that 
many manufacturers design their 
products very close to the product 
safety guidelines as a matter of cost 
containment. Many individuals, in- 
cluding office workers, children who 
play video games, and students 
may spend considerable time in 
close proximity to CRT's — either in 
TV sets or computer terminals. That 
doesn't even take into account the 
increasing time that many children 
spend watching TV. 

In the auto industry, we are buying 



safety in the form of redesigned car 
bodies, safety restraints, air bags, 
safety glass, anti-lock brakes, and 
making sure that we crash -proof 
this and that. 

I agree that we must not hamper 
the electronics industry, but at the 
same time, I believe that we must do 
more to safeguard people against 
radiation, which is both invisible and 
harmful, 

DONALD HANG 
North Canton, OH 

SNOOPER STOPPER 
SUGGESTION 

The article "The Snooper Stop- 
per" CRadio-Electronics, April 
1992) was very interesting. But if a 
person is only interested in protect- 
ing his cable box from the bullet and 
ID signal, then why not use an FM- 
trap, which is available from Radio 
Shack (Cat. No. 15-577) for $3. 69? 
That would save about $20 com- 
pared to the cost of your project, 
and it needs no adjusting, 
MATT STANTON 
Shrewsbury. MA R-E 



tamp^dk 



Chicker 
Noodlej 






If you're in the market for great test and measurement gear, here's some food for thought: Tek makes a bunch of i 
All with the same enduring quality that made our scopes famous. We even have catalogs so you can order thesi 



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CIRCLE 185 ON FREE INFORMATION CARD 



WHAT'S NEWS 



continued from page 6 



probed with high-frequency radio 
signals. Those signals, under the in- 
fluence of the magnetic field, "ex- 
cite' the nuclei of the hydrogen 
atoms concentrated in blood and 
body organs, causing them to reso- 
nate. Those resonance signals are 
transmitted to a computer which 
converts them into digital data. 
Computer software reconstructs 
the data into a picture of the object 
being imaged on the computer's 
monitor, 

A flow encoding procedure that 
distinguishs between resonance 
signals emitted by moving hydrogen 
atoms in the bloodstream and those 
in the stationary organs and struc- 
tures sets GE's MRI angiography 
technique apart. Signals emitted by 
the motionless hydrogen atoms are 
suppressed while those from the 
moving atoms are highlighted. The 
technique can measure and calcu- 
late the flexibility of the aorta and 



various major arteries as well as 
most blood vessels. 

To explore the clinical relevance 
of the quantitative measurement 
technique, GE and Imperial College 
researchers will examine how vari- 
ous agents such as nicotine and ni- 
troglycerine alter the flow dynamics 
of blood within a vessel. 

Military technology for law 
enforcement 

In an effort to shed its type cast- 
ing as an exclusive defense 
contractor, the Westinghouse Elec- 
tronics Systems Group (Baltimore, 
MDD has unveiled a shopping list of 
law-enforcement related products 
that it has developed. They are in- 
tended for the war on drugs and are 
expected to make law enforcement 
safer and more effective. Among 
the products and systems are: 
• A vehicle equipped with ad- 
vanced electronics providing an 
automatic communications link to 
criminal and motor-vehicle data 
banks, and still-frame video capture 
and transmission. 



• A multi-sensor surveillance air- 
craft equipped with advanced sen- 
sors, communications, and naviga- 
tion systems for aerial sur^'eillance. 

• A handheld instrument that de- 
tects trace amounts of illicit drugs 
or explosives and displays its find- 
ings. The instrument does a chemi- 
cal analysis of a card that is passed 
over a suspect container. 

• Software for computer-assisted 
report entry and law enforcement 
management. 

By down-linking the multi-sensor 
aircraft's infrared and radar image to 
a ground base, the aircraft can also 
sen/e as an airborne command cen- 
ter to direct and coordinate gr3und 
activities. The vehicle-integrated 
payload-elevated reconnaissance 
(VIPER) system integrates radar 
electro-optical, communications, 
and computer technologies into a 
mobile target-detection and report- 
ing system intended for border sur- 
veillance. These are commercial 
versions of military systems that the 
company has developed over the 
past five decades. R-E 







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affordable prcxiucts diredly, in case you want to do more 
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Test and Measurement 



CIRCLE 185 ON FREE INFORMATION CARD 




Beckman Industrial DM1 OXL Digital Multimeter 





I 

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9 



22 




High-quality, innovative 

K meters at a 

hard-tO'beat price. 

CIRCLE 10 ON FREE INFORMATION CARD 



I ultimeter buyers on a bud- 
get have never had it so 
I easy — nor have they ever 
had it so hard. It used to be difficult 
to find a low-cost DMM that was 
full-featured and built with an eye 
toward safety. These days, it's easi- 
er than ever to find such meters, but 
it's getting more difficult to choose 
from among them. The latest crop of 
low-cost high-quality DMM's to hit 
the market are from Beckman In- 
dustrial (Instrumentation Products 
Division, 3883 Ruffin Road, San Di- 
ego, CA 92123.) Beckman's 
DM15XL, DM10XL. and DM5XL 
range in price from $34.95 to 
$59.95. The DM1 OXL, which we ex- 
amined, costs $44.95. 

The first thing we noticed about 
the DMWXL was its 3'/2-digit 
C2000-count) LCD readout. The 
large CO. 7-inch) digits are very easy 
to read. We also noticed the meter's 
non-traditional color — a charcoal- 
gray cabinet with green labels and 
accents. Although we certainly 
wouldn't buy a DMM because of its 
color, the people at Beckman say 
they did a lot of market research 
that led them to choose the green 
shade. 

The dimensions of the DMWXL 
are roughly 6x3xiy4 inches, the 
meter's face is dominated by a large 
rotary function-selector knob 
roughly in the center The LCD is 
above the knob, and a row of 4 input 
jacks is below it. Along the left fnont 
edge is what we regard as the unit's 




most innovative feature: A row of 
LED's give a rough idea of the volt- 
age level at the probes even if the 
meter's battery is dead! It's a good 
feature because many DMM users 
are careless about replacing the 
battery when the low-battery annun- 
ciator indicates that it's time to do 
just that. (We assume that's be- 
cause they don't know that a low 
battery can reduce a meter's ac- 
curacy tremendously, which could 
result in potentially dangerous situa- 
tions.) Beckman calls the feature 
the "Safety Tester'" 

The Safety Tester feature also 
makes sense for someone who 
doesn't use a DMM regularly — a 
home-owner for example, who oc- 
casionally uses a DMM when work- 
ing on a home-wiring project or 
when doing some work on his car. 
Even when he pulls the meter out of 
his tool box with a dead battery, he'll 
be able to use it for basic, low-preci- 
sion measurements, because the 
Safety Tester is powered by the volt- 
age being measured, not by the 
DMM's battery. 

Seven LED's indicate the voltage 
being measured: One yellow LED is 
used to indicate a negative voltage 
(or, in combination with another 
LED, an AC voltage.) A row of six 
red LED's indicates the voltage 
level; the levels indicated are 6, 12, 
24, 50, 110, and 230 volts. 

The DMM section of the meter 
measures AC volts in two ranges; 
(200 and 740 volts), DC voltage in 



five ranges C200 mV, 2, 20, 200, and 
1000 volts); and resistance in six 
ranges (200, 2K, 20K, 200K, 
2000K, and 20 megohms). A diode- 
test/continuity feature is also snsW- 
able. 

The DMWXL can measure DC 
current over five ranges (200 pA, 2 
mA, 20mA200mA,and10A). One 
test lead must be moved for current 
measurement to one of two current 
jacks — one jack handles current lev- 
els up to 200 milliamps; the second 
handles 10 amperes. Beckman has 
included two important safety fea- 
tures here. First, both current inputs 
are fused to protect both the user 
and the meter. Second, the meter 
will sound a warning tone if you have 
the test leads set up for current 
measurement while the function 
switch is in a voltage-measurement 
range. That's important because try- 
ing to measure a voltage with the 
test leads set for current could 
cause an excessively high current to 
flow. 

Along with the fusing, the 
DM1 OXL also provides good over- 
load protection on all functions and 
ranges. That's an important safety 
consideration missing from many 
low-cost meters. 

The accuracy specifications of 
the DMWXL are impressive for a 
low-cost meter. DC accuracy is 
rated at ±0,7% -Hi digit; AC ac- 
curacy at ±1%-f4 digits. DC cur- 
rent is rated at ± 1 % + 1 digit for 
readings in the 200-mA to 200-mA 
ranges, and at ±2% + 3 digits for 
readings in the 10-amp range. 

The lowest-cost meter in the se- 
ries, the DM5XL does not offer the 
Safety Tester feature and, in gener- 
al, provides lower accuracy and re- 
duced measurement capabilities. 
The DM15XL also lacks the Safety 
Tester but adds AC current mea- 
surement and a logic-probe mode. 

We were impressed by the con- 
venience and safety features built 
into the $44.95 DMWXL We rec- 
ommend it highly. B-E 



^BCtnms mM-^/M)' 



NOW 




ELEVEN-PIECE RACHET TOOL KIT 

Includes reversible ratchet handle, extension 
bar. six bits, two precision screwdrivers, and a 
cutter. Comes in fitted case. Get one for your 
shop, another for your car, another for your 
tool kit. To order send $11,75 USA shipping 
only. ELECTRONIC TECHNOLOGY TODAY 
INC., PO Box 240, Massapequa Park, NY 
11762-0240. 




TUNABLE 50dB NOTCH FILTERS— for TV, 

Can be tuned precisely to required frequency. 
Ivlodel 23H-Ch's 2-3 (50-66 Mhz) l^lodel 
46FM-Ch's 4-6 plus FM (66-108 Mhz) Model 
713-Ch's7-13 (174-216 Mhz) Model 1 41 7-Ch's 
14-17 (120-144 Mhz) Model 1822-Ch^ 18-22 
(144-174 Mhz) $30 each, includes shipping. 
Visa, MC, or check. (C.O.D. $5 extra). Fast 
delivery, 30 day money back. Quantity prices 
to $16. STAR CIRCUITS, RO, Box 94917, 
Las Vegas, Nevada 891S3, 1-800-535-7827. 




FREE CATALOG! ELECTRONIC TOOLS & 
TEST EQUIPMENT— Jensen's new Master 
Catalog, available free, presents major brand 
name electronics tools, tool kits, and test in- 
struments, plus unique, hard-to-find products 
for assembly and repair and custom field ser- 
vice kits available only from Jensen. All futly 
describedandillustrated.Enjoyfreetechnical 
support and rapid, post-paid delivery any- 
where in the Continental USA. JENSEN 
TOOLS, INC., 7815 S. 4eth St., Phoenix, AZ 
85044. Phone: 602-968-6231; FAX 
1-800-356-9662. 
ClFtCLE 1 ia ON FREE INFORMATION CARD 






TWO TRANSMITTERS IN ONE! 5 MINUTE 
ASSEMBLY! M0NEY8ACK GUARANTEE! 
New Law Enforcement grade device on a 
single chip is the most sensitive, powerful, 
stable room transmitter you can buy. Uses 
any 3V-12V battery. Or attach to telephone 
line to monitor all telephone conversations 
over 1 mile away without batteries! lOOmW 
output! 80-130MHZ. Receive on any FM radio 
orwideband scanner VT-75microtransmitter. 
$49.95 + 1.50 S&H. VISA, MC, MO. COD'S 
add $4.00. DECO INDUSTRIES, Box 607, 
Bedford Hills, NY 10507. 1-800-759-5553. 
CIRCLE 127 ON FREE INFORMATION CARD 



$495 FOR A PROGRAMMABLE DC 
POWER SUPPLY IS NOW A REALITY! 

• GPIB Interface Standard • Output Voltage/ 
Current Programming & Read back • Local & 
Remote GPIB Operations • Remote Sense 
Function • Programnnable Overvoltage and 
Overcurrent Protection • Software Calibra- 
tion • Superior Line/Load Regulation 

• Output Enable/Disable • 3 Year Warranty. 
FREE Orientation Video available. For de- 
tails, call: AMERICAN RELIANCE INC. 
800-654-9838 FAX: 818-575-0801. 

CIRCLE 17e ON FREE INFORMATION CARD 



CALL NOW 
AND 

RESERVE 
YOUR SPACE 



• 6 X rate $940.00 per each insertion. 

• Fast reader service cycle. 

• Short lead time for the placement of 
ads. 

• We typeset and layout the ad at no 
additional charge. 

Call 516-293-3000 to reserve space. 
Ask for Arline Fishman. Limited number 
of pages available. Mail materials to: 
mini-ADS, ELECTRONICS NOW, 500-B 
Bi-County Blvd., Farmingdale, NY 
11735. 

FAX: 516-293-3115 




APPLIANCE REPAIR HANDBOOKS— 13 

volumes by service experts; easy-to- 
understand diagrams, illustrations. For major 
appliances (air conditioners, refrigerators, 
washers, dryers, microwaves, etc), elec. 
housewares, personal-care appliances. 
Basics of solid state, setting up shop, test 
instruments. $2.65 to $5,90 each. Freie 
brochure. APPLIANCE SERVICE, PO Box 
789, Lombard, IL 60148. 1-708-932-9550. 

CIRCLE 84 ON FREE INFORMATION CARD 




CABLE TV CONVERTERS AND DE- 
SCRAMBLERS SB-3, TRl-BI, MLD, M35B, 
DRZ-DIC. Call tor catalog and price list. Spe- 
cial combos available. We ship COD. Ouan- 
tity discounts. Call for pricing on other 
products. Dealers wanted. FREE CATALOG. 
We stand behind our products where others 
fail. One year \rarranty. ACE PRODUCTS, 
1-600-234-0726. 

CIRCLE 7S ON FREE INFORMATION CARD 



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MACINTOSH DIGiTALCIR- 
CUITS TRAINER. Owners 
and users of a Macintosh 
computer (51 2ke with Sys- 
tem 4.1 or greater) who 
want to learn more about 
digital electronics can do 
so with Yoehc Software's 
MacBreadboard 1.0. In- 
tended for hobbyists and 
students, the transistor- 
transistor logic CTTL) train- 
er was designed to act like 
the hardware simulators 
used in nnany digital circuit 
courses. Unlike those sim- 
ulators which are based on 
a schematic approach, 
MacBreadboard provides a 
computer representation 
of a real-world object: the 
student manipulates IC 
chips and conductors, not 
individual gates. 

Students select a TTL 
device by number (i.e. 
7400) from a menu, place it 
on the representation of a 
PC board on the MAC 
computer's screen, and 
"draw" conductors to con- 
nect the power supply, re- 
sistors, capacitors, switch- 
es and other components 
just as they would in putting 
together a iab breadboard. 
According to Yoeric, the 
program permits students 
to simulate their laboratory 




CIRCLE 16 ON FREE INFORMATION CARD 



assignments before actu- 
ally doing them. The pro- 
gram is said to be able to 
supplement or be an alter- 
native to a formal course 
on digital circuits. 

MacBreadboard permits 
the student to select from 
among over 30 two-state 
devices, breadboard, 
power supply, wires, LED's, 
buzzer seven-segment dis- 
plays, switches, and a logic 
probe. Timing diagrams of 
circuits that have been sim- 
ulated can be displayed 
and printed out. A 
"snapshot" of the bread- 
board can also be printed. 
Integrated circuit sche- 



matics can be displayed by 
double-clicking on the sym- 
bol of a device. The pro- 
gram runs in color, gray 
scale, and black-and-white. 
In the color mode, the 
traces can be colored by 
length or node, or the user 
can specify the color desir 
ed. A 50-page manual with 
diagrams of sample circuits 
that can be simulated is in- 
cluded. 

MacBreadboard 1.0 
costs $59.95; educational 
discounts are available. — 
Yoeric Software, 600 South 
Churton #24, Hills- 
borough, NC 27278; 
Phone: 919-644-1620, 



PACKET MODEM/TERMINAL 
MODE CONTROLLER A 

Commodore 64/128 com- 
puter and a handheld VHP 
or HF single-sideband 
transceiver with the 
MFJ-1271 are your tickets 
for admission to packet 
communication. MFJ's 
modem/terminal mode 
controller plugs into your 
Commodore's rear cas- 
sette port, it works both 




CIRCLE 17 ON FREE 
INFORMATION CARD 

VHP packet at 1200 baud 
and HF packet at 300 baud. 
A data carrier detected cir- 
cuit and adjustable thresh- 
old control reduces noise 



susceptibility and in- 
creases the chances of 
making QSO connec- 
tions — especially on HP 
bands. 

A DCD circuit with a 
LED indicates when you 
are receiving signals prop- 
erly. The device also fea- 
tures remote packet opera- 
tion, mailbox-like message 
forwarding, and Net/ROM 
emulation. It uses MFJ En- 



terprises's Digicom/ 
64 public software 
(MFJ-12931 

The MFJ-1271 costs 
$49,95.— MFJ Enterprises, 
Inc., RO. Box 494, Missis- 
sippi State, MS 39762: 
Phone: 601-323-5869 (for 
orders: 1-800-647-1800): 
Fax: 601-323-6551. 

GENERAL-PURPOSE CUT- 
TER. Cable TV and com- 
puter network installers, 
and technicians working 
with different kinds of coax- 
ial cable and wire need 
sharp, general purpose 
cutters, GC Electronics 




CIRCLE 18 ON FREE 
INFORMATION CARD 

says it meets this need 
with its No. 12-457 5-inch 
cutter The tool is said to 
cut through all sizes of 
coaxial cable cleanly and 
crisply, without crushing 
the cable. It is also capable 
of cutting other kinds of 
wire used in electrical and 
electronic work. 

The No. 12-457 cutter 
sells for $3.50.— GC Elec- 
tronics, 1801 Morgan 
Street. Rockford.lL 61 102. 

AUDIO REFERENCE GENER- 
ATORS. The ARG-440 and 
ARG-1000 audio reference 
generators from Tobin Cin- 
ema Systems are said to 
generate pure, accurate 
440-Hz (A4 to musicians) 
and 1000-Hz tones. The 
generators also provide 
precision "pink" and 



CIRCLE 19 ON FREE 
INFORMATION CARD 



"white" noise for audio 
^ tests. 

A 44O-H2 frequency 
standard is used in tuning 
musical instruments and 
even whole orchestras. 
The frequency can also ver- 
ify that tape speed is cor- 
rect and that VU 
reference levels are set. A 
frequency of 1000 Hz is the 
traditional reference level. 
Both models of audio refer- 
ence generator have 
stated accuracies of 10 
parts per million, 3 ppm 
CO. 0003%) typical. 

Pink noise applied to 
tape heads after the refer- 
ence tone permit playback 



equalization to be precisely 
set when used with a real- 
time analyzer That noise 
can also be used for room 
equalization. Moreover, 
pink and white noise can be 
mixed to simulate the 
sound of rain, a waterfall, 
surf, or various hissing 
noises. 

The outputs of the audio 
reference generators are 
electronically balanced at 
600 ohms and deliver 
dBm. They can also be un- 
terminated at -1-6 dBu. un- 
balanced at dBu, or 
loaded for a lower signal 
level. Each generator set 
includes a calibrated circuit 
board, color-coded de- 
tachable 16-wire cable, a 
wrall-outlet AC to DC con- 
verter, and a mating DC 
power plug. Both can be 
operated from any -Hi 2- to 
-l-35-volt DC source. 

ARG-440 and 

ARG-1000 audio reference 



generators are priced at 
$150.— Tobiir Cinema Sys- 
tems, 3227 49th Avenue 
SW, Seattle, WA 98116; 
Phone: 206-932-7280. 

ALLIGATOR CLIPS. A family 
of five alligator clips from 
/7T Pomona permits the 
safe electrical testing of 
components and systems 
carrying up to 250 volts. 
The clips are available in a 
range of sizes: large heavy 
duty, large, medium, mini- 
ature, and disposable. All 
alligator clips are coated 
with durable plastic insula- 
tion to prevent shock haz- 
ard, shorting, or grounding 
to conductive surfaces. 

Tinned copper-alloy jaws 
firmly grasp wires or leads 
and receptacles with con- 
nectors accept 2- to 4- mm 
C0.087- to 0.157-inch) lead 
wires. The miniature and 
disposable clips are intend- 
ed for tests on densly pop- 



ulated circuit boards in 
restricted locations. They 
are also useful is such 
medical applications as 
electrocardiogram testing. 
The larger clips are suitable 
for testing for high-current 
withstand capability and 
electrostatic -control prod- 
ucts. 




CIRCLE 20 ON FREE 
INFORMATION CARD 

The large, heavy-duty 
Mode! 5785 grips objects 
up to 9.5-mm (0.37 inch) in 
diameter It has an overall 
length of 81 mm (3. 19- 
inch), and it accepts a 
sheathed banana plug. It 
will protect against 250 
volts. The large Model 
5786 clip grips objects up 




EVEN AT $39, 

THE BLUES Can Last 

A LUNG, LUNG TIME. 

Conventional wisdom says if you spend less than forty 
bucks on a prcte, it won't be long unti! the thrill is gone. 
But DuraprobeS™ start at m, llve practically 
forever, and work with almost any scope around, so it 
won't surprise us if you pick up a whole case. After all. 
some folks were just bom to have the blues. 

Duraprobe 



63w-iBe5ai-i 



Brownell / Caroiton-Bates / CMI-Metermaster / Contact East / ENTEST / INOTEK 

ITC / Jensen Tools, Inc. / Joseph Electronics / Marshall Industries 

Radar Electric / R.S. Electronics / Zack Electronics 



t 
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25 



CIRCLE 92 ON FREE INFORMATION CARD 



1 




lU 



1939 Plaza Real 
OCEANSIDE. CA 92056 
Phone (619) 630-4080 
Telefax {619) 630-6507 



20 Lumber Road BLDG. » 2 
ROSLYN, NEW YORK 11576 
Phone (516) 484-7121 
Telefax (S16( 484-7170 



to 10 mm CO. 39 inch) in di- 
ameter. It includes a screw 
connection for lead wires 
upto18AWG(2.4mm). Its 
overall length is 80.5 mm 
(3.17 inches). 

The Model 5787. 56-mm 
(2.20-inches) long medium 
clip, connects to a standard 
4-mm banana jack. The 
Model 5788 miniature clip 
has a miniature banana jack 
and an overall length of 40 
mm (1.57 inches). The dis- 
posable Model 5791 clip, 
with an overall length of 53 
mm (2.09 inches), has a 
button fix/release for lead 
retention and a standard 
banana jack. 

The alligator clips are 
priced from $.98 to $3.45 
each.— ITT Pomona Elec- 
tronics, Customer Service, 
1500 East Ninth Street, 
P.O. Box 2767, Pomona, 
CA 91769; Phone: 
714-469-2900; Fax: 
714-629-3317. 

INTEGRATED SURFACE 
MOUNT WORKSTATION. 

Manufacturers who per- 
form paste and place sur- 
face-mount component as- 
sembly in small volume can 
improve their yields and 
their productivity with the 
SMT-6000p\ck/ place/ dis- 
pense system from OK In- 
dustries. 

The mechanically as- 
sisted, solder-paste dis- 
pensing and component 
placement system is de- 
signed to achieve place- 
ment rates of up to 600 
components per hour. It in- 
tegrates a solder-paste dis- 
penser and vacuum pick-up 
head onto a single arm as- 
sembly. That arm can be 
moved in the X-Y-Z-0 axes 
while the operator's hand is 
stabilized on a movable 
hand rest. 

Needle positioning for 
paste dispensing, is said to 
be precise and repeatable, 
reducing placement loca- 
tion error by as much as 
67%. According to OK In- 




CIRCLE 21 ON FREE 
INFORMATION CARD 

dustries, the mechanical 
assistance of arm assem- 
bly provides a three-fold in- 
crease in production over 
manual pick-and-place 
methods. For prototyping 
and batch production, a 
board can be pasted and 
populated in one worksta- 
tion while secured in the 
adjustable, locking PC 
board holder Movement is 
minimized because the 
board remains fixed during 
both the pasting and popu- 
lating operations. 

The SMT-6000 is sold 
complete with a 45-com- 
partment carousel, 12-inch 
and 15-inch PC board hold- 
ers, a self-contained vac- 
uum source for pick-and- 
place operations, time/ 
pressure controls for dis- 
pensing, a hand rest, and a 
pick/place nozzle kit. Op- 
tional accessories such as 
stick and reel component 
feeders, a light/magnifier, 
interchangeable spare ca- 
rousels, and a feeder- 
mounting bracket are also 
available. 

The SMT-6000 SMT 
workstation sells for 
$3750.— OK Industries, 
Inc., 4 Executive Plaza, 
Yonkers, NY 10701; 
Phone: 914-969-6800; 
Fax: 914-969-6650. 

TRANSDUCER POWER SUP- 
PLY. The Model 4130 en- 
capsulated power supply 
from Calex offers adjusta- 
ble voltage output for 
powering transducers, 
strain gages, and many 
kinds of laboratory equip- 
ment. The power supply 
provides 4 to 1 5 volts DC at 
up to 1590 milliamperes, 
enough power for three 



cmCLE IBS gN FREE INFORMATtOM CARD 



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"QUICKCross "WiY 
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ilatile direct from N 
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dlstribulor. For your i 
nearest one, call NTEtfil 
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Enclosed (iIbssb Nnil my checlf or monsK Mder tor S 

(U.S. funds only.) 



Address — _ — . 

^CIlY __ -„ -StelB 

|.Attach ihls coupon to your lotlnrtieatl and mail to: 
PNTE, « Fairand SI.. Blnomr ■ ■ '■ ■ "'fi'" 



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■MO Ows" software lunsTn MS-UUSananvlBMPnR'Ormiiatible wllh 640K oi 
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only Z.I Mbytes of liafil disk space when loaded, tt is a public dom aiij .^ e yge . 
MS-DOS ts a registered irademafk Q( Microsott Cotpotation. ' ^^'"^ "' 

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> CIRCUE 160 ON FREE INFORM* 



WMn39 




Ybu'ie Serious 

About a Fkituie in 

Electronics, Ensure tliat 

Fkituie with tiie Best 

Educational It'aining 

Availaiile. 




-f you want to leiirn about electrorv 
V and earn a good income with that 
lowledge then CIE is your best 

lucational value. 

crE's reputation as the world 
ader in home study electronics is 
jsed solely on the success of our 
'aduates. And we've earned that 
putation with an unconditional 
>mmitment to provide our students 
jth the very best electronics 
aining. 

Just ask 
riy of the 

50,000-pfus ^^^ 

raduates of m ij S"'' ;; i ^m I 

ie Cleveland B ■^ *.-''" —_ ^V / 

istitute of 

lectronics 

^ho are 

/orking in 

igh-paying 

ositions with 

erospace, 

omputer, 

ledical, 

lUtomotive 

ind communi- 

ation firms 

hroughout the 

vortd. 

They'll tell you success didn't 
;ome easy.. .but, it did come.. ..thanks 
o CIE. And today, a career in elec- 
ronics offers more opportunities and 
jreater rewards than ever before. 

CIE'S COMMnTED TO BEING 
THE BEST.... IN ONE 
AREA... .ELECTRONICS. 
CIE isn't another be-everything-to- 
e very body school. We teach only one 
subject and we believe we're the best 
at what we do. Also, CIE is accredited 
by the National Home Study Council. 
And with more than a 1,000 gradu- 
ates each year, we're the largest 
home study school specializing 
exclusively in electronics. CIE has 
been training career-minded students 
like yourself for nearly 60 years and 

we're the best at our subject 

ELECTRONICS ... BECAUSE ITS THE 
ONLY SUBJECT WE TEACH! 




CIE PROVIDES YOU WITH A 
LEARNING METHOD SO 
GOOD, IT'S PATENTED. 
CIE's Auto-programmed lessons are a 
proven learning method for building 
valuable electronics career skills. Each 
lesson is designed to take you step-by- 
step and principle-by-principle. And 
while all CIE lessons are designed for 
independent study, CIE's instructors 
are personally available to assist you 
with Just a toll- 
free call. The 
result is practical 
training... the 
kind of experi- 
ence you can put 
to work in today's 
marketplace. 

LEARN BY 

DOING.. .wrm 

STATE-OF- 
THE-ART 
FACIUTIES 
AND 
EQUIPMENT. 

In 1 969, CIE 
pioneered the first Electronics Labora- 
tory course and in 1 984, the first 
IMircoprocessor Laboratory course. 
Today, no other home study school 
can match CIE's state-of-the-art equip- 
ment and training. And all your 
laboratory equipment, books, and 
lessons are included in your tuition. 
It's all yours to use while you study at 
home and for on -the -job after 
graduation. 

PERSONAUZED 

TRAINING.. ..TO MATCH YOUR 

BACKGROUND. 

While some of our students have a 
working knowledge of electronics 
others are just starting out. That's 
why we've developed twelve career 
courses and an A.A.S. Degree program 
to choose from. So, even if your not 
sure which electronics career is best 
for you, CIE can get you started with 



WHY CHOOSE CrE FOR YOUR TRAINING? 

■ 1 50,000 successful graduates from every country around the world. 

" Only CIE rewards you for fast study. CIE offers an Associate Degree 
program based on actual study time used. The faster you complete your 
degree the less your overall tuition, 

■ State-of-the-art laboratory equipment is yours to keep and it comes 
assembled, ready for hands-on experiments. 

■ Approved for educational benefits under the G.I. Bill for veterans and other 

eligible persons. 

■ Upon graduation, CIE offers free preparation to pass the Certified 
Electronics Technician Exams. 




core lessons applicable to all areas of 
electronics. And every CIE course you 
take earns you credit towards comple- 
tion of your Associate in Applied 
Science Degree. So you can work 
toward your degree in stages or as 
fast as you wish. In fact, CIE is the 
only school that actually rewards you 
for fast study, which can save you 
thousands of dollars. 

SEND TODAY FOR YOUR CIE COURSE 
CATALOG AND WE'LL SEND YOU A 
FREE 24 PAGE CIE ELECTRONICS 
SYMBOL HANDBOOK! 



I 1 ■ E5h I want to get started. 

Send me my CIE school catalog includ- 
ing details about the Associate Degree 
Program. (For your convenience, CIE 
will have a representative contact you - 
there is no obligation.) AFi5 

Name: . 



Address;. 



City;. 



State: 



Zip: 



-Age:. 



Phone No. | ) 

Check box for G,l. Bulletin Benefit: 
n Veteran O Active Duty 



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CLEVELAND 
INSTITUTE OF 
ELECTRONICS 

1776 East 17th Street 
Cleveland, Otiio 44114 
(216)781-9400 



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A scliDol or thoussridj. 
A clasj or orw- 



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CIRCLE 22 ON FREE 
INFORNWTION CARD 



350-olim gages or trans- 
ducers that require 10-volt 
excitation. 

Voltage can be adjusted 
with a built-in potentiome- 
ter Line and load regulation 
are 0.05%. Ripple and 
noise are less than 0.5 milli- 
volt rms. The power supply 
has built-in remote sensing, 
it is short-circuit pnatected, 
and it has an internal ther- 
mal shutdown switch. The 
Model 4T 30 can operate at 
full load to temperatures of 
70°C. It measures 3,75 x2 
x2,87 inches and weighs 
only 18 ounces. The case 
has two molded-in mount- 
ing holes, and mounting 
bolts are provided with the 
supply. 

Options for input volt- 
ages for the Model 4130 
are 110, 115, 220, 230, or 
240 volts AC. Prices start 
at $122.— Calex Mfg. Co., 
Inc., 2401 Stanwell Drive, 
Concord, CA 94520-4841; 
Phone: 800-542-3355: 
Fax: 510-687-3333. 

COAXIAL ADAPTER CABLE 
KIT AND CONNECTOR KIT 

Test Probes' universal 
coaxial adapter cable kit. 
TPi'SOW, is intended for 
use with the company's 
TPI-3000A connector kit. 
Each of the six adapter ca- 
bles in the kit accepts all 
combinations of BNC, 
TNC, SMA, N. UHF. Mini- 
UHF. F, and RCA con- 
nectors. 

According to the manu- 
facturer, any combination 
of two connectors from the 
24 available in the 
TPI-3000A kit can be at- 



tached to the ends of one 
of the six universal cables 
in the TPI-5010 kit. Be- 
cause no crimping or sol- 
dering is required, the 
cables can be used repeat- 
edly and in different config- 
urations. The six RG-58 
cables in the kit are double- 
braid shielded. 48 inches 
long, and have soft poly- 




CIRCLE 23 ON FREE 
INFORMATtON CARD 



vinyl chloride CPVC) jack- 
ets. 

The TPI'3000A con- 
nector kit include two male 
and two female connectors 
forBNC, N, UHFandTNC 
adapters and one male and 
one female connector for 
the SMA, Mini-UHF F. and 
RCA adapters along with 
six universal interfaces. 

All connectors have sil- 
ver-plated machined brass 
shells and gold-plated con- 
tacts. Both kits are said to 
be convenient for servicing 
communications equip- 
ment and local-area net- 
works in the field, and 
interfacing or connecting 
for various RF systems and 
test equipment. 

The TPI-50W kit con- 
taining six cables and a 
plastic-coated wall rack is 
priced at $98 , The 
TPI-3000A connector kit 
with 24 connectors sells 
for $150,— Test Probes, 
Inc., 9178 Brown Deer 
Road, San Diego, CA 
92121; Phone: 

800-368-5719, 

BRIGHT LED LAMPS. The 

light-emitting diode lamps 
in this new family from 
Lumex Opto/Components 
are intended as replace- 




CIRCLE 24 ON FREE 
INFORMATION CARD 

ments for incandescent 
lamps in existing prc>ducts. 
McLED's are made with 
from two to eight LED dies 
to obtain light output com- 
parable to that of the incan- 
descent bulb it replaces. 
The multi-LED lamps are of- 
fered with wire ends or 
standard incandescent 
lamp bases. They are said 
to njn cooler and save the 
time and cost of frequent 
filament lamp replacement 
in the field. 

The lamps are being sold 
as replacements for minia- 
ture and sub-miniatung in- 
candescent lamps with 
ratings from 2 to 20 volts 
AC or DC, The AC lamp 
replacements include mini- 
ature rectifier bridges to 
permit them to operate 
from AC sources, (Individu- 
al LED dies draw currents 
of 2 to 25 milliamperes at 
1,5 to 2.8 volts DC) The 
DC lamp replacements can 
be mounted directly on PC 
boards or front panels, 
Lumex obtains a near-white 
light output for its lamps by 
mixing LED dies that emit 
different colors on the 
same lamp header 

The pnces of McLED's 
vary from $1,00 to $10 
each, depending on order 
quantity, color, and pack- 
age.— Lumex Opto/Compo- 
nents Inc., 292 EastHellen 
Road, Palatine, IL 60067; 
Phone: 708-359-2790; 
Fax: 708-359-8904. 

DIFFERENTIAL OS- 
CILLOSCOPE PROBE. Two 

different signals can be 
measured on one os- 
cilloscope channel with this 
active differential os- 



cilloscope probe, and there 
is no need for a ground ref- 
erence to make the mea- 
surement. The model 
ADF15, from Test Probes. 
Inc. was designed to permit 
the oscilloscope to be 
grounded for safety while 
measurements are made 
without isolation ampli- 




CIRCLE 25 ON FREE 
INFORMATION CARD 

tiers. This feature is said to 
eliminate errors caused by 
the voltage differences be- 
tween two amplifiers and 
two probes. 

The ADF15 is intended 
for making high voltage dif- 
ferential measurements in 
switching power supplies, 
motor controllers that in- 
clude thyristors, and power 
MOSFET's. It can also 
make accurate measure- 
ments of small signal dif- 
ferences in the presence of 
high common-mode volt- 
age. The probe's band- 
width covers the range of 
DC to 15 MHz and it has a 
switchable x20 to x200 
attenuation mode. 

The probe is powered by 
four AA batteries or an ex- 
ternal 6-volt DC converter 
(not supplied). The price in- 
cludes standard probes, al- 
ligator clips, and spring-tip 
probes with banana-plug 
leads. 

The ADF15 probe is 
priced at $375.— Test 
Probes, Inc., 9178 Brown 
Deer Road, San Diego, CA 
92121; Phone: 

619-535-9292. R-E 




NEW LIT 



Use The Free Information Card for fast response. 



USING ONLINE SCIENTIFIC 
& ENGINEERING DATA- 
BASES; by Harley Bjelland. 
Windcrest/McGraw-Hill, 
Blue Ridge Summit, PA 
17294-0850; $26.95. 

Engineers, technicians, 
scientists, hobbyists, and 
technical writers always 
seem to be hungry for 
facts, and they might 
spend hours searching for 
just the right information 
before they start or com- 
plete a project. But we are 
now undergoing an infor- 
mation explosion, and it 
seems that the leading 
edge of scientific and engi- 
neering knowledge always 
seems to elude our ability 
to keep up. Books, maga- 




CIRCLE 26 ON FREE 
INFORMATION CARD 

zines. technical papers and 
other printed materials are 
no longer the only sources 
of technical data; on-line 
computer databases are 
helping out by providing 
current information that is 
easily accessible through 
your modem-equipped PC. 
This book explains how 
to conduct successful on- 
line scientific and engineer- 



ing datbase search with a 
minimum investment of 
time, effort, and expense. It 
describes the required 
computer hardware and 
software and explains the 
advantages and disadvan- 
tages of each database 
service. Step-by-step, illus- 
trated instructions tell you 
how to tap into the power 
of on-line databases, and 
sample searches show ex- 
actly what you'll see as you 
work your wffiiy through spe- 
cific database menus. Also 
explained are ways to save 
money by using command- 
line searches and other 
shortcuts. 

Descriptions are given for 
major technical and con- 



sumer on-line databases 
including EasyNet, Dialog, 
BRS, MEAD, STN, ORBIT 
Dow Jones, and EPIC. 
Techniques are presented 
for evaluating information 
obtained through on-line 
systems and putting it to 
profitable use. 

1992 CATALOG; from Jim- 
Pak Eiectrorvic Components, 
1355 Shoreway Road, Bel- 
mont, CA 94002; free. 

This 30-page free bro- 
chure from Jim-Pak con- 
tains listings and illustra- 
tions of over 600 of its 
products for electronic 
hobbyists and profession- 
als. For example, you'll find 
listings of the company's 



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• Experience Labs — professionally designed 
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• Industry Certification Tiaining Guide — provided 
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examinations you may take for your professional 
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To help you gel started on your education, Peoples 
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CIRCLE 27 ON FREE 

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offerings in resistors, ca- 
pacitors, trimmers, and po- 
tentiometers. You'll also be 
able to find active devices 
from diodes and LED 
lamps to digital and linear 
integrated circuits, micro- 
processors, and memo- 
ries. Packaging products 
being offered include 
breadboards, enclosures, 
connectors, fans, heat 
sinks and power supplies. 
Manufacturing equipment 
fram Jim-F^k includes sol- 
dering irons and hand 
tools. Reference and text 
books of interest to the 
electronics community are 
also listed in the catalog. A 
state-by-state listing of 
over 300 of Jim-Pak's 
stores is included. 

THE MODERN OSCILUIOR 
CIRCUIT ENCYCLOPEDIA; by 
Rudolf F. Graf. TAB Books, 
Division of McGraw-Hill 
Inc., Blue Ridge Summit, PA 
17294-0850; Tel. 
1-800-822-8138; $12.95. 

This circuit encyclopedia 
is a handy reference for 
those who want instant ac- 
cess to more than 250 
proven, practical oscillator 
circuit designs. Some of 
the circuits contain late- 
model ICs that simplify 
their construction and re- 
duce the number of com- 
ponents needed. Needless 
to say, they add to the ver- 
satility and reliability of the 
resulting oscillator 



Mr Grafs encyclopedia 
includes schematics for vir- 
tually every type of os- 
cillator circuit that has ever 
been designed — some 
that are very familiar and 
others that are obscure — 
even to experts. The 
names of many of the os- 
cillator circuits are familiar 
to students and seasoned 
professionals alike. Their 
operation is taught in engi- 
neering classes as well as 
vocational and military tech 
schools. There are, for ex- 
ample, the old familiar 
Armstrong, Clapp, Colpit- 
ts, Franklin, Hartley, Hertz, 
Miller, Pierce and Wien- 
bridge oscillators as well as 
audio, blocking, crystal, 
multivibrator and electron- 
coupled versions. 




CIRCLE 28 ON FREE 
INFORMATION CARD 

The schematics and de- 
scriptions are organized by 
application for easy refer- 
ence. The circuit sche- 
matics and descriptive text 
have been reproduced in 
the same form in which 
they were originally pub- 
lished in such sources as 
Radio-Electronics. This 
was done by Mr Graf to 
prevent transcription en'ors 
and make them instantly 
recognizable to readers 
who might have seen them 
in the past. The original 
source for each circuit is 
listed in a section at the 
back of the encyclopedia. 
That permits readers to re- 
fer back to the source pub- 
lications for additional infor- 
matton on construction and 
application. 

THE ARRL SATELLITE AN- 
THOLOGY: 2nd Edition; from 



The American Radio Relay 
League, 225 Main Street, 
Newington,CTQ8111;$8.0D. 

In the 30 years since the 
first amateur-radio satellite 
was launched, satellite 
technology has become in- 
creasingly sophisticated. 
Nevertheless, communica- 
tion with satellites has be- 
come easier. This collec- 
tion of articles from ARRL's 
(pSr magazine is intended 
to help amateur radio oper- 
ators participate in satellite 
communications; they dis- 
pel the myth that satellite 
operating is expensive and 
difficult. 




CIRCLE 29 ON FREE 
INFORMATION CARD 

Amateurs can access 
satellites with equipment 
they already own. The infor- 
mative articles discuss ac- 
tive amateur satellites, 
their operating features, 
and how to access them. 
Several articles, whose 
content is still valid today, 
were retained from the first 
edition. Subjects include 
satellite tracking and con- 
versing with other oper- 
ators in other countries. 
More recent articles dis- 
cuss presently operating 
satellites such as AMSAT- 
OSCAR13,andlookatthe 
next generation of OSCAR 
satellites. 

TROUBLESHOOTING & RE- 
PAIRING ELECTRONIC MU- 
SIC SYNTHESIZERS; by De- 
Iton T. Horn. TAB Books, 
Division of McGraw-Hill 
Inc., Blue Ridge Summit, PA 
17294-0850; Tel. 
1-800-822-8138; $16.95. 

As music synthesizers 
become more popular, 



there is an increasing de- 
mand for instruction mate- 
rial on their maintenance 
and repair. This book was 
written for musicians who 
want to repair their own 
equipment as well as elec- 
tronic hobbyists and tech- 
nicians who need a reliable 
source of information on 
synthesizer troubleshoot- 
ing and repair Mr Horn's 
book gives complete, step- 
by-step instructions for ser- 
vicing synthesizers and re- 
placing their components. 
Both the older analog and 
more modern digital instru- 
ments are covered. 

The first half of the book 
is devoted to locating and 
repairing problems that 
commonly occur in analog 
synthesizers. Those in- 
clude nonexistent, weak, 
or noisy output signals. 
Also described are meth- 
ods for repairing voltage 
sources, function gener- 
ators and keyboards. 
The book's second half 
covers digital synthesizers. 
It gives instmctions for re- 




CIRCLE 30 ON FREE 
INFORMATION CARD 

pairing digital oscillators, 
amplihers, and their power 
supplies. Topics discussed 
include logic probes and 
logic pulsers. One whole 
chapter is devoted to MIDI 
with discussion of cabling, 
channels and circuitry. -In- 
structions are given on 
what to do if your syn- 
thesizer fails to respond to 
MIDI commands. In addi- 
tion, the book offers advice 
on how to restore old or 
unusable synthesizers as 
well as how to modify and 
expand existing units. 



Couniersurveillance 



Wever before has so much 
professional information on the art 
of detecting and efiminating 
electronic snooping devices — and 
how to defend against experienced 
information thieves — been placed 
in one VHS video. If you are a 
Fortune 500 CEO, an executive in 
any hi-tech industry, or a novice 
seeking entry into an honorable, 
rewarding field of work in 
countersurveillance, you must 
view this video presentation again 
and again. 

Wake up.' You may be the victim of 
stolen words — precious ideas that would 
have made you very wealthy! Yes, profes- 
sionals, even rank amateurs, may be lis- 
tening to your most private con- 
versations. 

Wake up.' If you are not the victim, 
then you are surtounded by countless vic- 
tims who need your help if you know how 
to discover telephone taps, locate bugs, or 
"sweep" a room clean. 

There is a thriving professional service 
steeped in high-tech techniques that you 
can become a part of! But first, you must 
know and understand Countersurveilance 
Technology. Your very first insight into 
this highly rewarding field is made possi- 
ble by a video VHS presentation that you 
cannot view on broadcast television, sat- 
ellite, or cable. It presents an informative 
program prepared by professionals in the 
field who know the it industry, its tech- 
niques, kinks and loopholes. Men who 
can tell you more in 45 minutes in a 
sttaightforward, exclusive talk than was 
ever attempted befote. 

Foiling Information Thieves 
Discover the targets professional 
snoopers seek out! The prey ate stock 
brokers, arbitrage firms, manufacturers, 
high-tech companies, any competitive 
industty, or even small businnesses in the 
same community. TTie valuable informa- 
tion they filch may be marketing strat- 
egies, customer lists, product formulas, 
manufacturing techniques, even adver- 
tising plans. Information thieves eaves- 
drop on court decisions, bidding 
information, financial data. The list is 
unlimited in the mind of man — es- 
pecially if he is a thief! 

You know that the Russians sectctly 
installed countless mictophones in the 
concrete work of the American Embassy 
building in Moscow. They converted 




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what was to be an embassy and private 
residence into the most sophisticated re- 
cording studio the world had ever 
known. The building had to be torn 
down in ordet to temove all the bugs. 

Stolen Information 
The open taps from where the informa- 
tion pours out may be from FAX's, com- 
puter communications, telephone calls, 
and evetyday business meetings and 
lunchtime encounters. Businessmen need 
counselling on how to eliminate this in- 
formation drain. Basic telephone use cou- 
pled with the user's understanding that 
someone may be listening or tecording 
vital data and information greatly teduces 
the opporrunity for others to purloin 
meaningful information. 

r ► . — _« — — -.-, — «-, — ^»****-.^. 

CLAGGKINC ^^ 

P.O. Box 4099 • Farmlngdale, NY 11735 

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The professional discussions seen on 
the TV screen in your home reveals liow 
to detect and disable wiretaps, midget 
radio- frequency transmitters, and other 
bugs, plus when to use disinformation to 
confuse the unwanted listener, and the 
technique of voice sctambling telephone 
communications. In fact, do you know 
how to look for a bug, where to look for a 
bug, and what to do when you find it? 

Bugs of a very small size are easy to 
build and they can be placed quickly in a 
matter of seconds, in any object or room. 
Today you may have used a telephone 
handset that was bugged. It probably 
contained three bugs. One was a phony 
bug to fool you into believing you found a 
bug and secured the telephone. The sec- 
ond bug placates the investigator when 
he finds the real thing! And the third bug 
is found only by the professional, who 
continued to search just in case there were 
more bugs. 

The professional is not without his 
tools. Special equipment has been de- 
signed so that the professional can sweep 
a room so that he can detect voice-acti- 
vated (VOX) and remote-activated bugs. 
Some of this equipment can be operated 
by novices, others require a ttained coun- 
tersurveillance professional. 

The professionals viewed on your tele- 
vision screen reveal information on the 
latest technological advances like laser- 
beam snoopets that ate installed hun- 
dteds of feet away from the room they 
snoop on. The professionals disclose that 
computers yield information too easily. 

This advettisement was not wtitten by 
a countersurveillance professional, but by 
a beginner whose only experience came 
from viewing the video tape in the pri- 
vacy of his home. After you review the 
video carefully and undersrand its con- 
tents, you have taken the first important 
step in either acquiring professional help 
with your surveillance problems, or you 
may very well consider a career as a coun- 
tersurveillance professional. 

The Dollars You Save 
To obtain the information contained in 
the video VHS cassette, you would attend 
a professional seminar costing S350-750 
and possibly pay hundreds of dollars more 
if you had to ttavel to a distant city to 
attend. Now, fot only $49.95 (plus 
$4,00 P&H) you can view Countersur- 
veillance Techniques at home and cake 
refresher views often. To obtain your 
copy, complete the coupon or call . 



I 



to 



35 



GET THE LATEST ADVANCES IN ELECTRONICS 



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ENX)Y THE WORLD OF ELECTRONICS EACH MONTH! 

Subscribe to the best electronics magazine — 
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construction projects, feature articles on new 
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techniques, circuit design fundamentals, and 
much more. 

Electronics Now looks to the future and shows 
you what new video, audio and computer 
products are on the horizon. What's more 
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SREJ9 




VFX 

DIGITRL SIGNAL PROCCSSOR 



WOULD YOU LIKE TO CHANGE THE 

pitch of your voice or create 
such special audio effects as 
echo or reverb? We will show 
you how to build a voice effects 
processor (or VFX processor, for 
short) that can generate such 
unusual effects. We'll explain 
the basic algorithms used to 
perform these DSP (digital sig- 
nal processing) techniques, and 
examine the heart of 
the VFX hardware, the 
Analog Devices-2105 
digital signal process- 
ing microcomputer. If 
you*re on a tight bud- 
get, you'll appreciate 
that this project costs 
much less than any 
commercial single- 
effect generator. 

Before we describe 
the details of the hard- 
ware and software, let's 
look at what the VFX 
processor does. The 
VFX processor accepts 
audio signals, digitally 
processes the informa- 
tion in one of three 
user-selected modes, 
and amplifies the sig- 
nal for listening with a 
speaker or a pair of 
headphones. All you 
need besides the VFX 
processor is a micro- 
phone, a pair of head- 
phones, and a 9-voIt 
DC power source — all 
of which are available 
from the source given 
in the Parts List. 

Basic operation 

The VFX block di- 
agram is shown in Fig. 
1. A four-position DIP 
switch (of which only 
three are used) puts 
the VFX into one of 
four operating modes: 
harmonizer, echo, re- 
verb, and test. Tkble 1 
shows the DIP switch 



positions for each mode. The 
harmonizer voice effect raises 
or lowers the pitch of your voice. 
A high pitch makes you sound 
as if you're breathing helium, 
and a low pitch makes you 
sound like a baritone singer, in 
this mode, a single-digit LED 
readout indicates the pitch 
change level; is the maximum 
down shift (IJ%?oe Hz) and 9 Is 




I 



little DSP goes a long way 
in generating unusual 
sound eNects. 

CRAIG BORAX and DAVID BECK 



the maximum upshift (+305 
Hz), The VFX board powers up 
in level 4, which is no shift at all. 
A sHirr button lets you step 
through the range of pitch 
shifts; after 9 the processor re- 
turns to 0. Each pitch shift in- 
crement is approximately 51 Hz; 
we'll explain why later. 

The echo effect has an ad- 
justable delay; you can decrease 
the echo delay time by 
pressing the shift 
button. In this mode 
the LED displays a 
number from 9 to in- 
dicating a delay time of 
0.63 to seconds. 
Each press of the shift 
button decreases the 
time delay by 70 milli- 
seconds. 

The reverb effect is 
similar to the echo 
effect, except that the 
delay time is fixed at 78 
milliseconds and the 
amplitude of the feed- 
back signal is adjusta- 
ble from 0.5 to with 
the SHirr button. The 
effect Is more subtle 
than the echo effect 
and simulates the 
acoustics of a large 
room. 

The test mode helps 
troubleshoot the VFX 
board. The test mode 
will be discussed in 
greater detail later on. 



The basic cirouit 

As shown in the 
block diagram (Fig. 1), 
the VFX processor con- 
sists of a microphone 
input circuit that uses 
a National Semicon- 
ductor TP3054 CO- 
DEC (coder-decoder). 
an Analog Devices 
ADSP-2105 DSP (dig- 
ital signal processor), 
an 8K X 8 EPROM 
(eraseable program- 



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Name 



Address 



City. 
Zip. 



.State. 



. Phane 



VE^id tor new mentbgrs wly, sub^ to acctplance by EBC U.S. onJert tn 9hlppo<l Jth Cia» Book Pott. C^KIa 
must remit In U.S- lundL ApfMlcarHs (xjlficla the U.S. and Canada will racalva special ofdaring IratrLNrtlons. 

HE99J 



I 

tb 



m 

s 

3 

3 



41 






I 



I 

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42 




RESET 



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SHIFT 



DSP 
ADSP 
2105 



SERIAL 
INTERFACE 




DATA MEM 
BOOT MEM 

PROG MEM 



g^;ij;^^^E^^:;:;:;:ii;:;;;:;;;i:i 



ADDRESS A0-A1 2 



c 



OATADB-015. 



+ 9VDC 
INPUT 



POWER 
SUPPLY 



-0 + 9VDC 



-O-9V0C 



-0+5VDC 



-O +5 ANALOG 



7SEG 


u. 


L 




™..ji«,.j- J 




LATCH/ 

DECODER 
DRIVER 



-O-S ANALOG 



FIG. 1— VFX BLOCK DIAGRAM. The VFX has a microphone input, a CODEC, a DSP, 
EPROM, SRAM, power-supply circuitry, and audio conditioning. 



mable read-only memory), two 
8K X 8 SRAM's (static-random 
access memory), power-supply 
circuitry, and audio con- 
ditioning. The CODEC incorpo- 
rates an input anti-aliasing fil- 
ter, an A/D converter, a D/A 
converter, an output filter, and 
control circuitry. The SRAM's 
provide 8Kx 16-bit words of 
data storage to supplement the 
2105's internal 512 words. The 
DSP can access external memo- 
ry in 100 nanoseconds but has 
an internal wait-state generator 
to allow the use of slower de- 
vices. The VFX processor has 
three wait states programmed 
for external data memory ac- 
cess. 

The VFX processor performs 
four functions; the theory of op- 
eration for each implemented in 
hardware is virtually identical. 
The software makes the hard- 
ware perform these multiple 



effects. The EPROM hex code 
will be posted on the RE-BBS 
(516-293-2283, 1200/2400, 
8N1), as a file called VFX. HEX. 
Let's look at the algorithms used 
for each effect. 

Algorithms 

The harmonizer shifts the 
pitch of an audio signal, such as 
music or speech, up or down. 
One of the most widely Itnown 
uses of this technique is seen in 
the novelty musical group, the 
Chipmunks, Recorded in the 
early 60*s, the Chipmunks' up- 
pitch effect was made simply by 
playing back audio tapes at a 
higher speed. Today, the high- 
tech approach is to use digital 
signal processing. 

The principal algorithms per- 
formed by the DSP hardware for 
the harmonizer are the fast 
Fourier transform (FFT) and the 
inverse FFT (IFFT). Those al- 





TABLE 1— DIP SWITCH SETTINGS 






S1-a 


S1-b 


S1-C 


S1-d 


Harmonizer 


X 


ON 


ON 


ON 


Echo 


X 


OFF 


ON 


ON 


Reverb 


X 


ON 


OFF 


ON 


Test Mode 


X 


OFF 


OFF 


ON 



HI 
RAM 



LO 
RAM 



utf'ivj.'a.^ 



PROG 
SELECT 



fc 



1 



EPROM 



luuimm-mrmX 



gorithms convert the audio sig- 
nal in the time domain to the 
frequency domain, and then 
back again. Figure 2 shows an 
original audio signal and the 
data at each stage in the process 
as it is spectrum-shifted. Figure 
2-a plots the audio input versus 
time. Figure 2-b shows the fre- 
quency spectrum of the audio 
signal in 2-a. Figure 2-c shows 
the original spectrum at the top 
and the up-shifted spectrum at 
the bottom. Figure 2-d shows 
the original audio signal on top 
with the processed audio sig- 
nal, which contains higher-fre- 
quency components, at the 
bottom. 

The timing of the algorithm of 
the harmonizer is shown in Fig. 

THE FFT J 

The Fourier series and its related 
transforms and algorithms are widely 
used In electronics. The Fourier trans- 
form (FT) is a mathematical method for 
converting a signal from the time do- 
main to the frequerwy domain, or simply 
a way of expressing a continuous wave- 
form as a series of sine waves. The fast 
Fourier transform (FFT) is an algorithm 
enhanced for computer computation of 
a discrete Fourier transform (DFT), 
which is the digital equivalent of the 
Fourier transform. R-E 



3, and its block diagram is 
shown in Fig. 4. In Fig. 3, the 
input signal from the micro- 
phone is sampled at a 6,5-kHz 
rate. At that rate buffer #1 is 
filled in 19.7 milliseconds with 
128 samples. (That determines 
the pitch resolution because the 
resolution in the frequency do- 
main is the inverse of the sam- 
pling period, or 50.7 Hz.) Then 
the next 128 samples are stored 
in buffer #2. (The double-throw 
switch In Fig. 4 is there to sug- 
gest the toggling from one buff- 
er to the other) While buffer #2 
is being filled, the VFX pro- 
cessor begins the harmonizing 
effect by processing buffer #1 
through a 128-point FFT, then 
comes the shift, and then the 
IFFT The entire FFT/Shift/IFFT 
algorithm takes approximately 
6 milliseconds so that all pro- 
cessing is finished before the 
next buffer Is filled. That allows 
real-time processing with a 
minimal two-buffer delay of 
39.3 milliseconds between the 
time the microphone input ar- 
rives at the VFX processor and 
when it is output to the speaker. 
The echo-effect algorithm 
uses a digital implementation of 
an adjustable-length analog de- 
lay line as shown in Fig. 5. The 
input signal from the micro- 
phone is sampled at a 6.5-kHz 
rate. It is then summed with the 
delayed signal received nx455 
periods ago (where n is a 
number from zero to nine as 
shown on the VFX's LED dis- 
play). The delay line is imple- 
mented in 4K of external SRAM. 
The software allows the adjust- 
ment of the delay from 0.63 to 
milliseconds. 

The reverb effect is very sim- 
ilar to the echo effect (see Fig. 6) 
except that the length of the de- 
lay line is fixed at 78 millise- 
conds, and the reflection factor 
is adjustable from 0% to 50% 
with the SHIFT button. The re- 
flection factor determines the 
attenuation of the signal before 
it is stored in the delay line and 
simulates the reflection factor 
of a room. 

The test mode can be used 
during hardware checkout to 
isolate problems with your VFX 
board. We'll discuss how to use 
the test mode later. 




FIG. 2 — HARMONIZER ALGORITHM. In syou seethe audio Input vs. time, b shows the 
frequency spectmm of the audio signal, c shows the original spectrum at the top and 
the up-shifted spectrum at the bottom, and d shows the original audio signal on top 
with the processed audio signal at the tiottom. 



ACQUIRE BUFFER ^^ 



ACQUIRE SUFFER 12 



ACQUIRE BUFTER #1 



I PROCESS 
'buffer #2 



PROCESS 
SUFFER #1 



PROCESS 
J BUFFER 






OUTPUT BUFFER 11 



6ni5 



OUTPUT BUFFERS 



OUTPUT BUFFER t^ 



19.7ms 



FIG. 3— HARMONIZER TIMING DIAGRAM. The input signal Is sampled at a 6.5-kHz rate 
and fills buffer #1 in 19.7 milliseconds with 128 samples. The next 12S samples are 
stored in buffer #2. 



Clrcuitiy 

The schematic diagram for 
the VFX processor is shown in 
Fig. 7. The ADSP-2105 DSP mi- 



croprocessor, ICl, has IK X 24- 
bit words of fast program mem- 
ory (PM) on chip. An on-chip os- 
cillator requires a 10-MHz 



-8 



03 

01 

a 

3 

O 

a> 
Z 



43 




ZERO 
BUFFER 



FFT 
BUFFER ^ 



FFT 
IM«5 

BUFFER I 



FREQ 
SPECTBUMS 
SHIFT I 



lUAG 



IP 



mpuT 

BUFFER j 

#1 i 



TwavMjyTf,-! 



INPUT 

BUFFER 

#2 



u 



s> 





OUTPLFT f 

BUFFER ( 



™ n ^ ,^ ;^ 

I' nu^ i Li J 1 BUFFER ■ 



REAL I — * 



128 

POINT 

INVERSE 

FFT 



IMAG 



'•'■"-■-''«»■ 



FFT 

REAL 

BUFFER 



OUTPUT 

BUFFER 

#1 



^ 6 




FR 

IMAG 

BUFFER 




OUTPUT 

BUFFER 

#2 




AODitf 
OUTPUT 




iv^^ CODEC\ rf 



T — ■ 

i 



e 



44 



AUDIO 
INPUT 




CODEC E 
ADC 



ADJ. 
LENGTH 
DELAY 



^■''^^^■■■•"■^11 



€^^ 



FIG. 4— HARMONIZER BLOCK DIAGRAM. The double-throw switches indicate the 
toggling from one buffer to the other. Wiiile buffer #2 is being filled, tlie VFX processor 
begins processing buffer #1. 



crystal (XTALl) and two small 
capacitors (CI and C2). On 
power-up and after a reset, the 
2105 boots the program from 
the EPROM (IC2) into the on- 
board memory. The boot func- 
tion is built into the 2105 and it 
allows a slower and inexpensive 
EPROM (250 ns) to supply the 
IK words (3K bytes] of PM . The 

BOOT MEMORY SELECT (BMs) Out- 
put of the 2105 selects the 
EPROM, and the addressing is 
automatically generated on the 
external address bus. The selec- 
tion of the program booted can 
be programmed by the 2105, 
but to simplify the VFX hard- 
ware and software, the program 
is selected by setting the three 
most-significant bits (MSB's) of 
the EPROM's address with DIP 
switch SI. 

In addition to the on-board 
PM, there is 0.5K x 16-bit words 



«J..'jH.,off; 




AUDIO 
OUTPUT 



FIG. 5— ECHO-EFFECT BLOCK DIAGRAM. A digital implementation of an adjustable- 
length analog delay line Is used. 



ADJ. 
0TO.5 



AUDIO 
INPIH" 




CODECS 
ADC 



-^ 




^ 




_^ CODEC 
DAC 



I 



'AUDIO 
OUTPUT 



FIG. 6— REVERB EFFECT SLOCK DIAGRAM. The length of the delay line is fixed at 78 
mitliseconds, and the reflection factor is adjustable from 0% to 50%. 



P^ 
S|S 

= 3 eg 
§•0 

§=§ 

6- o o 
o =* Li 

2 ft ^^ 
O, 3; (D 

3? O 

3 O-o 

■5 6 
"1 

^ tt 

Mi U> 

3- a 
<C O 
M^ 
o O 

U1 -I 



* M 

3 a 



J3 
MIC 

INPUT 



5 S 




MOfg so!uojpa|3 ■;?66i jaqwojdBS 




TtiB Analog Devices ADSP-2105 is 
the engine o( the VFX processor. The 
ADSP-2105 is a secorHJ-generation dig- 
ital signal processing (DSP) microcom- 
puter based on the earlier ADSP-2100. It 
has significant architectural Improve- 
menls over earlier generations (see 
block diagram in Fig. 10). The 2105 has 
bultl-in data memory RAM (0.5K x 16 
bits) and program memory RAM (IK x 
24 bits) so it really is a DSP microcom- 
puter artd not a microprocessor. Both of 
those memory banks are expandable 
with off-chip fast static RAM. That allows 
the program memory to be loaded, 
using the resident boot memory loader, 
from a slow PROM or EPROM (250 
nanosecond access) and keeps high- 
speed data transfer Inside the chip to 
reduce EMI and board-layout require- 
ments. 

The program and data memory can 
be easily expanded of(-cb?p — as has 
been done with the VFX processor — 
when the internal data memory is not 

I sufficient for the atgofilhms. The chip 
has resources built-in to simplify exter- 
nal memory hardware interfacing. They 
include separate selects for program 
memory, data memory, and boot memo- 
ry, and a programmable wait-state gen- 
erator to allow for slow external 
memories. 

hThe 2105 incorporates several pe- 
- 



THE ADSP-2105 

ripheral devices and their associated in- 
terrupts. There is a built-in 16-bit interval 
timer with programmabie prescaler and 
tnlerrupts, A high-speed synchronous 
serial interface (SPORTi) can interface 
to |i.-law and A-law CODEC'S using 
hardware companding as well as digital 
audio-oriented D/A and A'D converters. 
Additionaliy, the serial port can connect 
multiple 2l05's together in parallel pro- 
cessing applications. 

The ADSP-2105 also offers high per- 
formance by virtue of its instruction set. 
With a 100-nanosecond cycle time, mul- 
tiple operations per cycle, and zero- 
overhead looping, the numerical perfor- 
mance of the chip is respectable. In ad- 
dition, the 1-mlcran low-power CMOS 
processing holds power dissipation to 



less than 1 watt: a powerdown mode 
reduces the power consumption to a 
mere 80 milliwatts. 

The ADSP-2105 incorporates three 
execution units: 

• Barrel shifter 

• Arithmetic Logic Unit (ALU) 

• Multiplier Accumulator (MAC) 

The three units are optimized for their 
specific function, and are, therefore, 
very fast, completing any instruction in 
one cycle. Access to the three execution 
units is made via registers associated 
with each execution unit. For example, 
the ALU has the following 16-bit regis- 
ters: 

AXO, AXI, AYO, AY1, AR, and AF 
The MAC has; 
MXO, MX1, MYO, MY1, MRO, MR1, MR2, 



LISTING 1 



START : 



10' 
M0= 
I4< 
M0= 



buffer#l; 
1; 

bu£fer#2; 
^1; 



CNTR=204a; 
DO KOVE^BUPFER UNTIL CB; 
AR=PM(I4,M4); 
DMCIO,MO)=AR; 
MOV buffer: 



{Address of buffBi:#l in DMD} 
{Post modify value} 
{Address of buffer#2 in PHD} 
{Post modify value} 
[Number of words in buffer} 
{Do loop} 



H 



{End of 



loop} 



I 



I^^ 



J 



rP 



DATA 




DATA 


ADDRESS 




ADDRESS 


GENEFUTOH 




GENEFtATOR 


*1 




« 



±z 



s 



sz. 



I 



77 



INSTRUCTION A- 
REGISTEB V- 



J£ 



PROGRAM 
SEQUENCER 



7T 



TV 



nX 



\> \> 



INPUT REGS 



OUTPUl rtEGS 



I 



CI 



a 






JL 



PROGHAM 
SRAM 



A A 



DATA 
SRAM 



\> 14 . 



PMA BJS 



U . DMA BUS 



zzi 



T5 



24 , PMBBUS 



<J_ 



BUS I/' 

EXCHANGE 



TV 



INPUT REGS 



OUTPUT REGS 



RBUS 



n 



ci 



16 B BUS 



I 



16. 



ni 



TT 



INPUT REGS 



SUIfTEB 



OUTPUT REGS 



n 



<iJ 



7% 



BOOT 

ADDRESS 
GENERATOR 



iz 



iz 



n 



CONTROL 

LOGIC 



1 



46 



FIG. 10— AOSP-2105 BLOCK DIAGRAM. The 2105 has built-in data memory and pro- 
gram memory implemented In fast SRAM. That keeps high-speed data transfer inside 
ttie chip. 







LISTING 2 




I8Q2 




0004h 


SPORT 


(TranHinlt) 


OOOBh 


S PORTO 


(Receive) 


OOOCh 


SPOSTl 


( Transmit ) 


OOlOh 


SP0RT2 


( Receive ) 


0014h 


TIMER 




0018b 



ft 

f; RQitl—THE EZ-LAB KIT Includes a demo boartt, an ADSP-21CI1^5 family assembler, 
linker, and other miscellaneous development software. Vou can design and debug 
software for certain appilcations at minimal cost. 



and MF 

The barrel sdifter has: 

SB, S!. SE, SRI, and SRO 

In addition, the ADSP-2105 incorpo- 
rates two data address generators 
{DAQ^), one of which can perform the 
bit reversing that is required for certain 
FFT algorithms. One DAG accesses 
program-memory data (PMD) and the 
other accesses data-memory data 
(DMD). The DAG'S use a set of three 
registers to control indirect addressing 
and circular buffers. Ttiose are the index 
registers (10 to 17), the modify registers 
(MO to M7), and the length registers (LO 
to L7). For example, by setting up the 
registers so that 10 has the starting ad- 
dress. MO has a value of 1, and LO is 
zero, blocks of data can be moved from 
one buffer to another with very little pro- 
gramming (see Listing 1). 

To be successful, any microcomputer, 
Including a digital signal processor, 
must have readily available low-cost 
software tools. Analog Devices has sup- 
plied the ADSP-2105 with quality soft- 
ware tools at a reasonable price. The 
assembly language is algebraic and 
straightforward. Included is a powerful 
personal computer-based software sim- 
ulator that allows software debugging 
without an expensive in-circuit emulator 
(ICE). 

The ADSP-2105 has the same kind of 
interrupt handling capat«lities as other 
microcomputers. The interrupts can tie 
individually masked or enabled, edge- 
triggered or level sensitive. Interrupts 
are vectored to the prog rami memory lo- 



cations shown in Listing 2. A second 
mirror set of Data registers can be en- 
abled to facilitate fast context switching 
during its interrupt servicing. The device 
has on-chip clock generation circuitry 
and is packaged In a 68-lead plastic 
leaded chip carrier (PLCC). 

The VFX processor described in this 
article was developed with Analog De- 
vices' ADSP-2101 EZ-Lab Kit {see Fig. 
11), The Analog Devices EZ-Lab kit in- 
cludes an EZ-LAB demonstration 
board, an ADSP-2101/5 family as- 
sembler, linker and other miscellaneous 
development software. Including the es- 
sential simulator. With this package one 
can design and debug sofhrare for cer- 
tain applications with excellent results at 
minimal cost. Of course, an in-circuit 
emulator (ICE) will speed up the de- 
velopment process, although, of course, 
at a much higher price: the EZ-Lab kit 
sells for less than $500 dollars, and an 
emulator costs more than $2000 dollars. 
For people with limited capital resources 
and small to medium complexity al- 
gorithms, the kit (s great. R-E 



of on-board data memory (DM). 
Since that is not enough to per- 
form the 128-point FFT and 
IFFT, two external static RAM's 
are also attached to the data 
bus, one for the high byte (ICQ), 
and one for the low byte (IC8) of 
the memory. That 2 x 8K bytes 
of SRAM addressed by the 2105 
is accessed when the data mem- 
ory SELECT (DMs) strobe Is ac- 
tive. 

The seven-segment LED dis- 
play adds to the interactivity of 
the VFX processor, and is writ- 
ten to as if it was external pro- 
gram memory. The program 

MEMORY SELECT CPMS) Signal 

from the 2105 is activated to 
latch data from the bus into 
ICll (the seven-segment BCD 
latch/decoder/driver), which 
then drives the seven segment 
display. No decoding is required 
for the selection of ICII because 
there is no external program 
memory in the system. 

The VFX processor uses a CO- 
DEC to digitize the audio input 
and convert it Into a serial data 
stream. The CODEC interfaces 
directly with the 2105's syn- 
chronous serial port SPORTl, 
which includes pins 52-56. 
SPORTl is configured for 8-bit 
synchronous data transfer with 
word- framing sync pulses and 
p,-law companding. The 2105 
generates a 1.66-MHz serial 
clock (scLKi) and 6.5-kH2 fram- 
ing pulses on transmit frame 
SYNC (TFSi) and receive frame 
SYNC (RFSi) to s3fnchronize the 
data transfer. 

The CODEC implements ji-- 
law companding, which im- 
proves the dynamic range of the 
conversion by taking advantage 
of human perception of sound; 
that is, that the ear is much 
more sensitive to noise in low- 
level (volume) signals than in 
high-level signals. The CODEC 
receives and transmits 8 bits of 
data, and the digital signal pro- 
cessor has built-in companding 
hardware to convert it into a 14- 
bit number 

The other components of the 
VFX processor are the power 
supply and analog components. 
The VFX board accepts + 9 volts 
DC and generates -9, +5, 
-1-5,1, and -5.1 volts DC. Volt- 
age converter IC7 {a TSC7660) 



I 
I 



z 



47 



IC7 — 



S 



48 



IC1 




^^T!!!^. 'M ^1 



si^ . c^-rl^.gg t. 



IC6, 



R10 



C4 -——^11 



IC3 



■"Ot1 



^R7— -^^ cur 



•leii 



D3 ■— CT 



t-G6 
-R30— 



C30 



FIG. 8— PARTS-PLACEMENT DIAGRAM. Make sure that you install the mono jack at J1 
and the stereo jack at J2. 





PARTS UST '^— WB^^^"""^" 




All resistors are Va-watt, 5%, un- 


107— 7805T 5-voit regulator 




less otherwise noted. 


108, IC9— 6264-15 SRAM. 150 ns 




R1-R3— 120,000 Ohms 


IC10— 74HC14N hex Schmitt trig- 




R4, R9, R12-R19, R22-R29, 


ger inverter 




R33-R39, R41-R49— not used 


iC11— CD4511 7-segment decoder/ 




R5-R8— 10,000 ohms 


driver 




RIO, R1 1—220.000 Ohms 


D1, D2— 1N5231B 5.1 -volt Zener di- 




R20, R21— 1000 ohms 


ode 




R30— 10 ohms 


D3— 1N4001 diode 




R31— 470 ohms {x7). 14-pin DIP 


D1SP1— LTS6780R 7-segment 




R32— 10,000 ohms ( y< 5), 6-pin SIP 


common cathode LED 




R40 — 10,000 ohms, muititurn po- 


Other components 




tentiometer 


XTAL1— 10-MHz crystal 




R50 — 200,000 ohms, muititurn po- 


S1^4-position DIP switch 




tentiometer 


S2, S3 — momentary pushbutton, 




Capacitors 


N.O. 




CI, C2 — 20 pR 100 volts, ceramic 


J1 — 2mm DC power jack 




C3-C7— 10 jlF, 35 vofts, electrolytic 


J2 — mini stereo jack 




C8, C9, C11-C15, C17-C19, 


J3 — mini mono jack 




C23-C29,C31-C34, C3&-C3&— 


Mlscellarreous: 10 sockets, 9-volt 




not used 


DC wall transformer, microphone, 




CH>— 220 )iF, 25 volts, electrolytic 


headphones, PC board, solder, 




CI 6—10 tip, 6.3 volts. Tantalum 


etc. 




electrolytic 


Note; The following Items are 




C20-C22— 1 fLp, 50 volts, ceramic 


available from American Dis- 




C30— 0.047 M-F 100 volts, ceramic 


tributors, Inc., 9 Whippany 




035—47 pF, 100 volts, ceramic 


Road, Whippany, NJ 07981 




C40-C50— 0.1 M-F. too volts, ce- 


{800) 877-0510: 




ramic 


• VFX kit (includes PC board 




Semiconductors 


and all PC-mounted compo- 




101— ADSP-2105KP40 DSP pro- 


nents) — $105 


§^ 


cessor 


(plated through holes, solder 


s 


IC2— 27256-25 32K x 8 EPROM 


masked and silkscreened) 


1 


{256K) 


• 9-volt wall transformer — $12 


IC3— TP3054J CODEC 


• Headphones — $15 




104— LM741N op-amp 


• Microphone — $16 


t 


IC5— LM386N-3 audio amplifier 


Add $5 shipping and handling. 


1" 

z 


tC6— 7660SCPA voltage converter 


Check, MasterCard, or Visa. 



generates the negative supply 
From the positive supply. A 5- 
volt DC regulator {1C7, a 7805) 
supplies +5 volts DC to the 
2105 and all logic IC's, and two 
Zener regulators (Dl and D2) 



generate the analog voltages of 
plus and minus 5.1 volts DC. 
Op-amp IC4 and audio amplifier 
1C5 condition and amplify the 
audio input and output, respec- 
tively. 



Construction 

The VFX processor is easy to 
build. All the necessary compo- 
nents including a double-sided 
PC board, all IC's, semiconduc- 
tors, and passive components 
are available from the source 
given in the Parts List. A micro- 
phone, DC virall outlet trans- 
former, and headphones are 
Edso available if you don't al- 
ready have them. We've pro- 
vided foil patterns In case you 
want to make your own PC 
board. 

Following Fig. 8 as a guide, 
mount the components begin- 
ning with the resistors. Next in- 
stall the capacitors, the crystal, 
switches, jacks, voltage reg- 
ulator (IC7). and then all of the 
IC sockets. Make sure you don't 
install the input and output 
jacks in the wrong locations. 
The output jack has three ter- 
minals so that if you use head- 
phones you'll hear sound from 
both sides. Be sure to orient the 
polarized capacitors correctly. 
Do not InstEill the IC*s yet and 
don't remove them from their 
packaging just yet either. When 
you've completed the soldering, 
carefully double check parts 
placement and look for solder 
splashes and bridging. The 
completed VFX card is shown in 
Fig. 9. 

Hardware checkout 

Now wc will perform a hard- 
ware checkout, one IC at a time. 
Precautions against static dis- 
charge should be followed when 
handling the IC's. Electrostatic 
discharge can cause very subtle 
damage in the IC that can be 
hard to find— the kind that is 



RLTER DESIGN SOFTWARE 

The digital filter used in the echo and 
reverb effect was designed with the filter 
and digital analysis software {FDAS) 
from Momentum Data Systems soft- 
ware. The software was used to imple- 
ment a rmlte impulse response (f^lR) 
filter. Tt>6 optional code generator wrote 
the source code for ihe filter, given its 
characteristics. The pacloge also runs 
on the ADSP-2101 processor and other 
family members. The PDAS software 
can also implement other kinds of digital 
filters than FtR. including infinite im- 
pulse response (IIR) and some analog 
equivalents. R-E 




COMPONENT SIDE of the VFX board. 




SOLDER SIDE of the VFX board. 

worth avoiding. 

First apply 9- volt DC power to 
Jl and verify that there is 5 volts 
on the power pins of each IC 
socket. When verified, remove 
power from the board and plug 
in IC6, the negative-supply gen- 



erator. Now reapply 9-volts DC 
to Jl and measure pin 5 of IC6; 
the voltage should be the nega- 
tive of the voltage on IC6 pin 8 or 
- 12 volts (whichever is less). 

Next, check pins 1 and 4 of 
IC3 for - 5 volts ±0.2 volt and 
-1-5.0 ± 0.2 volt, respectively. 



Install ICl. IC2, ICIO, and ICll 
in their respective sockets. For 
the RAM test, set all the SI DIP 
switches to the "on" position 
and apply power to the board. 
The LED display should show 
the number "6." Press the shift 
continued on page 94 



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FROM 

^ NotWorking 
^NETWORKING 

Learn about basic and advanced equipment 
for troubleshooting LAN's. 





IS PART 2 OF A THREE-PART SE- 

rles on troubleshooting Jocal- 
area networks (LAN's). In Part 1 
we presented technical back- 
ground on network tech- 
nologies including cable typ>es, 
topologies, signal schemes, and 
access protocols. This time we 
introduce the tools and test 
equipment necessary to service 
LAN's quickly and effectively 
Next time well put our knowl- 
edge to work in diagnosing and 
solving easy and difficult net- 
work problems. 

Experts say that cable faults 
cause more than 70% of all net- 
work failures. Cable faults may 
sound simple in theory but. in 
practice, diagnosing and locat- 
ing them can bring strong men 
to tears. However, common 
sense, good test equipment, 
and intelligent substitution 
; techniques can take you a long 
way toward rapid, inexpensive 
repair. 

Common sense helps you lo- 
calize the problem to avoid 
wasting time performing irrele- 
vant tests. Good test instru- 
ments are your eyes and ears 
into the LAN; equipment can be 
as simple as a S20 digital multi- 
meter (DMM) or as complex as a 
time-domain reflectometer 

L(TDR) costing thousands of dol- 
lars. (A TDR uses radar-like 
techniques to measure the dis- 
tance to a cable fault. Typically a 
test Instrument transmits a sig- 
nal and measures the time it 



GARY McCLELLAN 

takes for its reflection to return 
to the source.) 

Gone are the days of mind- 
lessly swapping computers, 
boards, and cables. Instead we 
use Intelligent swapping to lo- 
calize a problem, and then use 
appropriate test equipment to 
find dbe suspect part. Next we 
install a substitute, and If the 
LAN comes to life, that part re- 
mains. Otherwise, we will re- 
peat the process until the fault 
disappears and the LAN comes 
on-line. 

Some training firms claim 
that only a screwdriver is re- 
quired to service a LAN. We 
won't go that far — but with the 
techniques discussed here. 
well come close. 

Hand tools 

Common hand tools are 
useful in servicing LAN's. T&ble 
1 describes the basic require- 
ments; you'll probably add 
other, more specialized tools to 
the list as time goes on. 

One quick and easy way to get 
the tools you need is to buy a 
Jensen tool kit. For example, 
the reasonably priced JTK-5 
tool kit contains all the essen- 
tials for servicing Ethernet 
LAN's. Also check with Jensen 
for tools and tool kits suitable 
for twisted-pair and Tbken Ring 
LAN's. 

Probably the most common 
problem in LAN service is con- 
nectors. Sooner or later, you'll 



have to replace a bad one. The 
best way to learn the proper 
techniques is to work with 
someone already skilled in the 
art. Falling that, there are other 
resources. Ity a local electronic 
parts distributor for manufac- 
turer's literature on connector 
installation. Or locate a copy of 
the Radio Amateurs Handbook, 
published by the American Ra- 
dio Relay League. The Con- 
struction Practices chapter of 
that handbook describes the 
proper way to install BNC-type 
coaxial connectors. You might 
also contact AMP and other 
manufacturers to request as- 
sembly information on their 
crimp-on coax and R J-xx series 
connectors. The sidebar lists 
several sources of information. 

The DMM 

No service technician in his ' 
right mind would be caught 
dead without a DMM; it is liter- 
ally indispensable. You can use 
it to service LAN's, and also to 
check building AC-line power 
and repair electronic equip- 
ment of all tjrpes. DMM's are 
available with a dazzling variety 
of features. If you are shopping 
for a DMM, choose a S'/a-dlgit 
unit, tike the one shown in Fig. 
1, that Is easy to use, has the 
features you really need, and 
has a low price. Minimum LAN- 
specific requirements for a 
DMM include a to 200 ohms 
range, a continuity beeper, a 



•S 
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3 



53 






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54 




FIG. 1— A BASIC OMM, like the Fluke Model 70, is an indispensable tool for LAN 
troubleshooting. 



to 20-volts DC range, and a to 
200-volts AC range. Most 
DMM's sold today meet those 
minimum specifications. 

I^t's discuss briefly how you 
can use a DMM for LAN servic- 
ing. Resistance and continuity 
are probably the most used 
functions in LAN servicing. Use 
the ohms function to measure 
the resistance of cables and ter- 
minator resistors, and to locate 
shorts or opens in cables and 
connectors. A low-end range of 
to 200 ohms is important be- 
cause coaxial cables typically 
measure less than 5.0 ohms 
end-to-end, and twisted pair 
less than 20.0 ohms. To make 
this type of measurement, first 
power down the network to 
avoid affecting LAN operation. 
Disconnect questionable cables 
before making measurements. 

High-resistance cables can 
have partially severed wires or 
bad connectors. Test all termi- 
nators (connector bodies con- 
taining 50-. 91-, or 100-ohm 



resistors) to ensure proper re- 
sistance. Use the continuity 
function to locate shorts and 
opens in cables and connectors. 
Audible beeps are especially 
useful when working in dark or 
tight places like plenums 
{dropped ceilings). 

The DC function is useful as 
well, Ethernet LAN's carry 5-volt 
power and data to the trans- 
ceivers attached to the back- 
bone cable. Use the DMM to 
verify that power is present at 
the transceiver if it does not 
have a Power Good indicator. 
You can also use the DC volts 
function to verify voltages in 
emergency lights and uninter- 
ruptable power supplies 
(UPS's). 

Last but not least, use the AC 
volts function to measure AC 
power outlets and noise levels 
on the UW cables. It is not un- 
common for power problems to 
cause trouble on a LAN, par- 
ticularly when the file server or 
hub computer is affected. Then 



the whole network may crash. 
Just check the outlet voltage 
with a DMM, and if it is outside 
the 105 to 125-volt AC operating 
range of most computers, call 
an electrician! 

Noise problems can be a big 
headache, especially on LAN's 
with unshielded twisted-pair 
(UTP) cable. Noise causes ran- 
dom data errors and, in serious 
cases, can crash the network. 
Measure noise with a DMM by 
connecting it to one end of the 
cable, making sure the other 
and is terminated properly. The 
DMM reading for a good UTP ca- 
ble can be in the range of 5 milli- 
volts or less. A high reading cam 
uncover unusual faults such as 
a coil of excess cable or cable 
routed too close to EMI sources 
such as fluorescent lighting fix- 
tures. In fact, the author once 
determined that a 50-foot coil of 
excess UTP left on top of a light 
fixture by an Installer was caus- 
ing intermittent problems on a 
newly installed LAN. The prob- 
lem drove everyone crazy for 
months! Using a DMM as a 
noise meter has limited utility 
because DMM's measure voltage 
in the kHz range, not in the 4 to 
16-MHz range typical of most 
networks protocols. 

Worse, DMM's don't measure 
impulse noise, which is es- 
pecially disruptive to LAN oper- 
ation. For that type of measure- 
ment, we must go to more 
specialized equipment such as 
that described in the following 
sections. 

Microtest cable scanner 

Microtest was the first compa- 
ny to provide specialized, all-in- 
one LAN test equipment such as 
the Microtest Cable Scanner. 
This handheld instrument con- 
tains everything you need to 
troubleshoot LAN cables, in- 
cluding ohmmeter, noise meter, 
time domain reflectometer 
(TOR), Ethernet activity 
monitor, and cable tracer. Best 
of all, the Cable Scanner is rea- 
sonably priced and readily avail- 
able. Figure 2 shows the Cable 
Scanner and several other sim- 
ilar models. 

Although optimized for Eth- 
ernet LAN's, the Cable Scanner 
also tests unshielded twisted 




FIG. 2— MICROTEST'S HANDHELD LAN TESTERS combine most-needed features in 
easy-to-use, hand-held packages. Clockwise from upper left are the Cable Scanner, 
the Ring Scanner, the Pair Scanner, and the Quick Scanner. 



pair {UTP). shielded twisted 
pair (STP). Token Ring, and 
RS-232 cables with simple 
adapters. In addition, Mlcrotest 
offers specialized scanners spe- 
cifically for testing unique fea- 
tures of other cable. 

Key features of the Cable 
Scanner include resistance and 
continuity functions, a basic 
noise meter, and a TDR, The 
noise meter is a simple AC volt- 
meter that reads millivolt noise 
in the 1-kHz range; it has no 
capability for measuring im- 
pulse noise. Due to the shield- 
ing nature of coaxial cable, 
noise problems are less com- 
mon in Ethernet systems — but 



they do happen. The Cable 
Scanner is adept at sensing 60- 
Hz power-line noise that often 
appears in problematic coaxial 
cable systems. 

The TDR function can locate 
shorts and opens in LAN cables. 
Operating it is as simple as 
pushing a button. The device 
then injects pulses into the ca- 
ble where they travel until they 
strike a fault, and subsequently 
bounce back to the instrument. 
The Cable Scanner measures 
the travel time, calculates dis- 
tance to the fault, and then dis- 
plays the distance. All you have 
to do is inspect the cable at that 
distance and repair the fault. 



Remember that for a TDR to 
work properly, all equipment 
must be turned off Otherwise, 
data on the line could cause 
false distance readings — not to 
mention what it would do to on- 
line computers ! You should also 
know that all TDRs have a blind 
spot, or dead zone, from where 
the instrument connects to 
some distance down the cable. 
The Cable Scanner cannot de- 
tect faults occurring within the 
first 25 feet of cable. If you sus- 
pect a fault in that section, in- 
spect the cable manually, or 
make another measurement 
from the other end of the cable. 

The Cable Scanner's Ethernet 
activity monitor is useful for 
spotting bad transceivers and 
other cases of network overload. 
Recall from Part 1 of this series 
that Ethernet works on a flrst- 
come, first-served basis, some- 
what like an old-fashioned tele- 
phone party line. Whoever 
speaks first gets the line. 
Should something go wrong — 
for example, a transceiver that 
"jabbers*' or talks all the time — 
traffic could soar to 100% 
usage. That, in turn, would pre- 
vent other computers on the 
network from exchanging data 
because their collision sense 
multiple access (CSMA) circuit- 
ry would force them to wait con- 
tinually. The result is that LAN 
operation would come to a 
grinding halt. 

The activity monitor counts 
the number of data packets 
(messages) sent between com- 
puters on the network over a set 
time period (for example, one 
second or one minute). Then it 
calculates percent usage. You 
then look up that value on a 
chart to determine whether 
there are problems. If so, you 
must troubleshoot to locate the 
cause of the fault. 

The Cable Scanner also has 
an optional cable tracer that al- 
lows you to trace a specific cable 
as it runs through the building 
alongside others. This is a 
handy feature because LAN ca- 
bles look alike, making it easy to 
waste time tracing the wrong 
cable. To operate the cable 
tracer, you must also purchase a 
cigarette-pack-size receiver. In 
operation, the Cable Scanner 



% 
I 

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3 

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55 



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56 



sends a special signal over the 
cable under test. Then you hold 
the receiver next to each cable in 
turn: the one that produces a 
warble tone is the one you want. 
Microtest also sells more spe- 
cialized instruments for testing 
other kinds of cables. For UTP/ 
STP cables there is the Pair 
Scanner, which addresses ma- 
jor twisted-pair concerns in- 
cluding impulse noise and 
signal loss through the cable. 
The Pair Scanner also has 
switching capabilities for se- 
lecting different transmit/re- 
ceive pairs, as well as a hub 
computer test function. For 
Tbken Ring cabling there is the 
Ring Scanner, which isolates 
faulty multistation access units 
(MAU's), determines whether 
the ring maintains continuity, 
and monitors network traffic. 
Interestingly, it can simulate 
network faults, so you can per- 
form "fire drills" on a good LAN 
and get a feel for symptoms be- 
fore they occur. All Microtest 
products provide a serial output 
for logging data or printing 
hard copy reports. 

Paladin Patch Check 

Growing popularity of UTP- 
based LAN's has created a mar- 
ket for special test tools. One 
good example is a simple, low- 
cost cable tester from Paladin 
Corporation called Patch 
Check, Patch Check, shown in 
Fig. 3, identifies the most com- 
mon faults in UTP systems, 
namely bad connectors, shorts, 
and opens. 

Patch Check tests the full 
range of UTP systems, from sin- 
gle- to four-pair cables termi- 
nated in RJ-11 or RJ-45 con- 
nectors. Operation is simply a 
matter of snapping both ends of 
the cable into the unit, pushing 
the Test button, and watching 
the indicators. Bad connections 
or opens appear as one or more 
unUluminated LED's; shorts ap- 
pear as multiple simulta- 
neously lit indicators. Paladin 
also offers a remote indicator for 
situations where you can't get 
at both ends of the cable. 

Patch Check can save lots of 
time. For example, in resolving 
one problem described in Part 3 
of this series, the author check- 



ed a cable with Patch Check in 
ten seconds, vs. five minutes on 
a DMM! 




FIG. 3— PALADIN'S PATCH CHECK pro- 
vides Instant go/no-go testing of RJ-11 
and RJ-45 telephone-style connectors, 
used for shielded and unshielded twist- 
ed-pair wiring. 



Tektronix 1502C TDR 

Of all the equipment dis- 
cussed in these articles, the 
Ttektronix 1502C TDR is oldest 
and best established. For find- 
ing tough problems it can't be 
beat. It can identify badly 
crimped connectors, crushed 
coaxial cables, wiring chewed 
by rodents, and more. It is sen- 
sitive enough to locate problems 
to within inches on the cable. 
The 1502C is a state-of-the-art 
version of a line of analog TDR's 
that goes back several decades. 

The 1502C looks much like a 
benchtop oscilloscope, as 
shown in Fig. 4. However, in- 
stead of the usual cathode ray 
tube (CRT), the 1502C has a liq- 
uid crystal display (LCD) to re- 
duce power consumption and 
weight. A removable reticle fits 
over the display, which shows 
cable impedance vs. distance. 
The operating controls are sim- 
ple, and there are less of them 
than on an oscilloscope. An ex- 
cellent operator's manual helps 
new or infrequent users operate 
the device. 

Key features of the 1502C in- 
clude a negative-going output 
pulse, which shuts down live 



Ethernet transceivers, and a 
zoom feature that allows you to 
examine tiny faults which show 
up as impedance spikes on the 
display. Zoom helps you find 
problems like rusty connectors 
or bad crimps. In Part 111 we will 
show how we found an un- 
authorized cable tap using 
these features. 

One important feature is the 
propagation-rate control. It's 
important because it deter- 
mines the distance accuracy of 
the TDR. As you might recall 
from physics class, electrons 
travel at the speed of light in a 
vacuum. But In the real world of 
copper cabling, signals travel 
much slower. The speed reduc- 
tion is due to insulation quality 
and conductor diameter. The 
propagation-rate control cali- 
brates the equipment to com- 
pensate for the slower con- 
duction In the cable, thereby 
providing correct distance in- 
dications. 



RESOURCES 
Following are addresses of 
manufacturers whose products 
were discussed in this article. 
Contact them for current pricing 
and more information. 

• Paladin Corporation, 3543 Old 
Conejo Rd., Newbury Park, CA 
92123, (800) 272-8665. 

• Jensen Tools, Inc., 7815 S. 46th 
Street, Phoenix, AZ, 85044, (602) 
968-6231. 

• Microtest, Inc., 3519 E. Shea 
Blvd. Suite 134, Phoenix, AZ 
85028, (800) 526-9675. 

• Radio Amateur's Handbook,"' 
American Radio Relay League, 
Newington, CT 06111. 

• Tektronix, Inc., Redmond Divi- 
sion, 625 S. E. Salmon Dr., Red- 
mond, OR 97756, (800) 833-9200. 

• AMP, Inc., P.O. Box 3608, Har- 
risbuig, PA 17105, (717) 561-6168. 



Typically you set the propaga- 
tion rate by consulting a chart 
published by the cable man- 
ufacturer or LAN equipment 
vendor. Values are usually ex- 
pressed as a percentage of the 
speed of light, c. The higher the 
percentage, the faster the sig- 
nals travel through the cable. 
Typical Ethernet backbone ca- 
ble has a propagation rate of 
0.76c. Some sources refer to 
propagation rate as the numer- 




FIG. 4— TEKTRONIX' 1502C TIME DOMAIN REf LECTOMETER provides analog dis- 
play of distance versus impedance. A knowledgeable technician can interpret tiie 
display to locate subtie LAN cable faults. 



ical value of propagation (MVP) 
or velocity factor (VF). The terms 
all mean the same thing. Re- 
gardless of name, it is impor- 
tant to set the propagation rate 
control of your TDR if you want 
it to display meaningful, accu- 
rate readings. 

Operating the 1502C is 
straightforward. You begin by 
powering down the LAN equip- 
ment on the questionable cable 
segment and removing any ter- 
minator resistors. (Terminators 
can trick a TDR into displaying 
fantastic cable lengths.) Then 
connect the TDR to the cable 
through an impedance adapter, 
install the correct display 
reticle, and apply power. Then 
adjust the controls, and you'll 
receive a visual indication of ca- 
ble quality. 

Tektronix makes several 
other TDR's. The 1503C analog 
TDR accommodates cables as 
long as 50,000 feet, and has an 
Ethernet option. The 1503C 
looks like a good choice for cable 
TV or aircraft carrier applica- 
tions. Tektronix also makes the 
TMA-802, a moderately priced 
digital TDR and Ethernet ac- 



tivity monitor. 

Analog vs. digital 

In this article, we have de- 
scribed two types of TDR's: dig- 
ital (Microtest) and analog 
tltektronix). Each type of TDR 
has its own advantages and dis- 
advantages; both instruments 
are widely used in LAN servic- 
ing. 

The major differences be- 
tween the two are in informa- 
tion display and sensitivity to 
minor faults. Push a button on 
a digital TDR, and you'll read 
something like Short 40 Ft on 
the display. Digital TDR's are 
great for novice users because 
they make it easy to understand 
results. Their drawback, how- 
ever, is that they report only ma- 
jor faults, missing minor ones 
that often cause the most frus- 
trating problems. 

TUm on an analog TDR and 
you'll see a oscilloscope-style 
wavy line over a black reticle cal- 
ibrated in impedance vs. dis- 
tance. Clearly the analog TDR is 
intended for more experienced 
users who can disregard the 
dead zone, interpret impedance 



changes, and read distance 
from the reticle. Analog TDR's 
also have an amazing sen- 
sitivity to rusty contacts in con- 
nectors, water-logged cables, 
and other faults that can go un- 
detected with less-sensitive in- 
struments. 

Network certification 

Another issue is network cer- 
tification, which is becoming 
increasingly important as cor- 
porations continue the down- 
sizing trend. Downsizing in- 
volves using networks of PC's to 
perform mission-critical ap- 
plications formerly run on 
mainframes. Mission-critical 
means that the health and com- 
petitiveness of the company de- 
pend critically on the computer 
systems that support the com- 
pany. Without a reliable net- 
work, workers can't do their 
jobs, so goods and services are 
delivered to customers late. If 
customer dissatisfaction in- 
creases, the company suffers, 
and so do jobs. Clearly, we all 
have a vested interest in keep- 
ing our LAN networks running 
reliably. 

In tihe past, LAN cables were 
often pulled by electrical or tele- 
phone wiring contractors who 
might not have had proper tools 
and expertise. As a result, Eth- 
ernet cables may exceed recom- 
mended lengths, excess UTP 
cable may be left coiled in plen- 
ums over fluorescent fixtures, 
and so on. Those problems de- 
crease LAN performance and, 
even worse, can serve to reduce 
reliability. 

In response, major LAN ven- 
dors have devised performance 
tests to help ensure that LAN's 
meet standards for noise level, 
cable length, attenuation, and 
other factors that affect perfor- 
mance and robustness. 

Without thinking out the 
problem the fanciest TDR in the 
world will be useless. Develop 
your ability to identiiy a prob- 
lem and logically work your way 
through possible causes until it 
is solved. 

Be sure to join us in Part III 
when we will roll up our sleeves 
and troubleshoot actual LAN's 
with the equipment and tools 
described here. R-E 



I 






57 




l^^ 



FIG. 1— FUNCTIONAL BLOCKS OF THE 5S5 TIMER with Its pinout identified. 



Learn to use the S5S and 556 timet IC in ptacticai 
circuits to obtain accurate time delays and square waves 



Si 



I 



z 



58 



IN ANY ASSOCIATION TEST FOR 

those who know integrated cir- 
cuits, the three digits 555 will 
summon up the instant re- 
sponse "timer IC." It's the short 
form generic designation for 
progeny of the NE555 , a popular 
monolithic timer/oscillator IC 
first introduced by Signetics 
many years ago. StiU widely sec- 
ond-sourced because of its ver- 
satility, the 555 ranks as a 
standard "building block. " 

The 555 and its derivatives 
can be found in thousands of 
different circuits, and its pos- 
sibilities for further applica- 
tions appear limitless. Al- 
though classed as a linear IC, it 
Is often used in digital or 
"quasi-digital" applications be- 
cause its inputs and outputs 
are essentially square waves 



rather than sine or other com- 
plex waveforms. This article ex- 
plains how the 555 works and 
shows you how to apply the IC 
in various practical control cir- 
cuits. 

A 555/556 overview 

Figure 1 is a simplified 
block diagram of the 555 show- 
ing its principal functional 
blocks: threshold comparator, 
trigger comparator, R-S flip- 
flop, low-power complementary 
output stage, slave discharge 
transistor, and a voltage-refer- 
ence potential divider. Both 
halves of a dual version of the 
555 (two 555's on a single chip), 
the 556, have identical elec- 
trical characteristics. The 
555/556 will run from 4.5 to 16 
volts DC, although a typical 



supply will be + 12 volts DC or 
less. 

The outstanding features of 
the 555/556 include: 

• Timing adjustable from mi- 
croseconds to hours 

• Duty cycle adjustable 

• Ability of output to source 
(supply) or sink (dissipate) 200- 
milliampere current 

• Output can drive TTL logic 
circuits 

• Temperature stability ex- 
ceeds 0.005%/°C 

• Normally "on" and normally 
"off output 

The 555 and 556 were de- 
signed for precision timing ap- 
plications, with the timing 
interval controlled by an exter- 
nal resistor and capacitor (RC) 
network. The devices contain 
voltage dividers consisting of 



Eli 



_ Supplement to Radio Electronics, SEPT. 1 992. 






10 KHz-50 MHz GENERATOR 
AN/URH-25 SIGNAL GENERATOR, covers 1 KHz to 50 

Q— \ MHz ir 9 bands; output to 100K uv into 50 ohms. 
,, ^ Modulation 0-50% 400 or 1000 Hz; internal 1 MHz 
- L'* calibrator. Includes impedance adapter, antenna simu- 
^.' * lator, two attenuators, test cable and manual repro. 
'* 'J Requires 115 VAC 60 Hz; 11.3x14x10.8, 52 lbs. sh. 

USED-REPARABLEw/outpJt... M9.50 CHECKED $159.50 

AC-DC MULTIMETER 
HICKOK 1 604M MULTIMETER, measures 0-300 VAC in 7-full 
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7 steps. AC probe uses EA53 tube allowing response to 700 i * . » 
MHz. SimilartoHP-410C; includes probes and manual copy. ' * 
Requires 115/230 VAC 50-400 Hz; 7.5x5,5x9.5, 13 lbs. sh 
USED-CHECKEfl (135.00 

DC GEAR MOTOR 

^^B Powerful reversible motor produces strong torque 

^HL at 6, 1 2, and 24 VDC, case common, turning 24, 50, 

.^B>. and 1 00 RPM respectively. Good robotics or display 

motor! 4.3x6x2.8 plus 4.5"Lx5/16" dia right angle 

worm drive shaft; 3 lbs. #GM-3455, NE W $15.00 

GROUNDED B-OinLET AC i_- m 

STRIP with lighted ON-OFF, ■■ 

RESET, and long 15' cord. 

13x1.8x2.5, 3 lbs. #ST-6AC, 

t»i8d $5.95...2/$10 Unused $9.95 

SELSYN TRANSMITTER 
SIZES BRASS SELSYN operates from 1 15/90 VAC 60 
Hz. Used in pairs, these are large enough for most 
precision rotation and position remote indicating tasks. 
(Selsyns are still the preferred positioning device for 
naval gunsl } 7.5'Lx4.5' dia, 1 2 lbs. sh. Used-diecked . . . $25 ea. $4S/pair 

VARIABLE ATTENUATOR 
6-STEP LADDER NETWORK AHENUATOR in 10:1 ratio. . 

Attenuates 0.1 V down to 0.1 uv; 50 ohm impedance. Has ' * ' ^ 
BNC input/output RF connections; shaft 3/4"Lj(1/4" dia with ' _ '\ 
gear drive. Silver-plated; p/o 0.01 -50 MHz RF generator, *• 
3.1x3.5x4.8x3.5, 4 lbs. #AT101/URMZ5, used $19.95 

Prices F.O.B. Lima, Q.« ViSA, MASTERCARD Accepted. 

Allow for Shipping • Write for latest Catalog Suppiement 

Address Dept. ES • Phone 419/227-6573 



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RS# Page R5# 

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296 Ali Electroaks 60A60-61 251 

231 AUtronics 60A39 — 

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Compt SckiK« 60A72 IS4 

— Andratech (S0A54 — 

216 Ayers & Assoctatts 60A58 — 

217 B&S Sales , 60A71 — 

218 Battery Tech 60A68 294 

300 Beige Bag 60A66 — 

219 BGMktro 60A16 256 

221 Cable View (SimcoasO 60A33 — 

282 CaJg LalK 60A59 308 

— CBC Internationa] 60A72 257 

303 Chase SeientiSc Co 60A3I 258 

— Cbenesko Products 6aA42 306 

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— Command Produrlions 60A32 — 

224 Communlcstiotts Specklisis 60A74 259 

225 CtMnpnter Business Mart 60A6g 261 

226 Consuniertronics 60A28 — 

227 ConlartEast .60A4-5 262 

228 Cool Amp Conducto Lube . . . 60A44-4S — 

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283 CrestWDOd Prt>duc(s 60A26 29g 

233 Daetroa - 60A72 301 

234 Dalbani Eleclronics . . , 60AI1 264 

235 Danbar Sales 60A75 265 

236 Davilyn Corp. 60A17 305 

299 DBSSateltltt 60A22 — 

232 DCEIectnmks 60A73 266 

230 Debco Electronks , 60Aa 268 

— Design Compulalion 60A36 307 

309 DSC Alarms 60A48 267 

239 EKI 60A3 269 

241 EleclronJc Goldmine 60A37 270 

242 Ekctronk Rainbow , 60A55 — 

— Enac iiK 60A42 — 

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243 Gateway Electronics 60A4T 271 

_ GAV Corp. 60A54 — 

244 Halted SpediUies Elcc Supply . . 60AT7 273 
285 Home Control Concepts 60A19 274 

— Hoopswaie 60A79 275 

245 Hosfelt Electronics Inc 60A12 291 

246 Infl Micttqiower Corp. 60A70 276 

247 Interactive Image "Rcbnologj 60A34-3S 277 

— lolronlcs, Inc, 60A72 302 

248 JDR Microdevices 60A4(M1 304 

297 JPC International Inc 60A62 279 

249 Kelrbi Electronics. 60A65 278 

_ L-ComTech 60A79 280 

250 Lake Sylvan Sale* 6CIA67 281 



Page 

LciB Baster\ Elcctraiiki 6QA28 

UM 60A36 

Mark V Electronics «JA36 

MCM Electronics 60A47 

Mendelson Electfonlcs Surplus. . (iOA21 

Menial Automation 60A30 

Meredith Instruments 60A46 

MicToTUnc 60A79 

MIdweit Laser 60A30 

Ming Enginrering 60A57 

MondolrcHiics 6iQA78 

Matron Electronics 60A79 

Mountaijj View Sales 60A7O 

Mouser Electronics. 60ASe 

MoTie View 60A3 

MWK Industries 6QA27 

Nat'l Amateur Radio Assoc. .... 60A74 
NatkMial Adtancement Corp. . . . 60A74 

Needham Electronic! 60A42 

New Sensor Corp. 60A20 

Oatley Etectronics 60A43 

Ocean State Electronics ........ 60A49 

Oblo AutomaUoR 60A79 

Optoelectronics 60A7 

hk Rat Electronks 60AS6 

Paladin Ekctiwila 60A74. 

ftrts Express Inc. 60A52-53 

PC BtMWis 60A56 

Penzar Development . , 60A64 

ftmergy Innovations 6iOA64 

ftHnrhouse 60A38 

Print (Fhx) 60A62 

FHim Resources 60A29 

Project Pro 60A66 

R-4 SystenB Ibc 60A58 

Ramsey Electronics 60A9 

RF Parte 60A43 

Rigd Corp. 60A66 

Rogers Specialists «)A24 

Sescom Inc 60A50 

^y vision Inc 60A23 

Software Science 60A72 

Spy Supply. - 60A58 

Slartek , 60A13 

Surjrius 'n«ders 60A6 

Sylech-tJ.S.A 60A80 

Tkch Systems 60A46 

TECl 60A70 

Timeline 60A69 

Toronto Surplits 60A14 

Ucando 60AW 

Uniled Electronic Su^ily 60A10 

URDA Inc 60A72 

Video Maker 60A13 

Video Repair Sdioal 60A32 

Viejo Publicatians 60A3S 

WPT Publications 60A25 

3Undi Electronics 60A54 



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OVIE VIEW SALES, INC. 



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P.O BOX 26 • WOOD DALE, (L 60191 

Call C.S.T. Monday thru Friday 9:00 - 6:00 • Sat. 10:00 - 2:00 

Friendly Courteous Service • 1 Yrs. Experience • 6 Mo. Warranty 



pRROLD 


1-3 


4 or more 


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125.00 


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•NEW SA-PIO-COMBO 


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EW TRI/BI PAN 


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110,00 
55.00 


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75.00 


55.00 


pBB-7212 


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8550: 


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NEW OAK N-12 COMBO(Vari Sync) 


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• Same Day Shipment • Quality Brands • Low Prices 




Model ZHS 



MAGNETIC PROBE 
SENSES MAGNETIC FIELDS 

This safe no n -cor tact probe allows you to trouble- 
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or any device using a coil. Aiso detects transient 
pulses as fast as lOmS and identifies north and 
soiJtti poles. Place the probe ciose to the coil and 
if the LED is on the device is energized. Probe 
Operating frequency is DC-400Hz. 




2MHz FUNCTION GENERATOR 

Features a 4-digit frequency counter display. 
Operates at 12 0/220/240 VAC 50/60Hz. Complete 
with power card, one cable BNC to insulated clips, 
manual and 1-year warranty. 



Reg. IIW." 
Model ZC381 200 

HANDHELD 
1.25GHz 
FREQUENCY 
COUNTER 

Microprocessor-based cojiter measures 
frequency from 10 Hz to 1 .25GHz and period 
from O.lps to 100ms. Includes data hold, min/ 
max/average readings and relative frequency 
measurements. Complete with 4 AA batteries, 
manual and 1-year warranty. 




$55, 



00 



Reg. $59.<* 
Model ZC375370 



PROGRAMMABLE 
DIGITAL TIMER 

Provides up to 6 on and 6 off 
settings per week with a min- 
imum switcti time as low as 
1 minute. Plugs into 3-prong 
1 10VAC outlet and has battery backup (AM 
battery inci) to prevent programs from being 
cleared during power failure. Rated at 15amps, 
UL listed. 





Reg. i9S" 
Model RCDS1 
Tool Case 



Reg. $298.°' 
Model R53-CDS1 
Tool Kit 



DOUBLE-SIDED 
CORDURA® CASE 

One side has 45 pouches to hold your tools, the 
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SERVICE 
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56 piece tool kit includes the cas« above plus 
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(DMM is not incl.) 




$39, 



00 



$409. 

Reg. $499." 
Model ZV212 

HITACHI 

20MHz DUAL CHANNEL 
OSCILLOSCOPE 

Panel layout is color-coded to Identify functions 
easily. Sensitivity Im/div. Complete with probes, 
operator's manual and 3-year warranty. 



Reg. W5.» 
Model ZSP1 00 



X1,X10 
SWTtCHABLE 
OSCILLOSCOPE PROBE 

Monolithic probe features a 100 MHz bandwidtti, 
a 3.5ns risetime, a wide compensation range 
{lOpF to 60pF), a break- resistant center conductor 
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hook, BNC adapter, iC and insulating tip and 
trimming tool. Cable length is 1.5 meters. 




$36, 



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Reg. $42.^ 
Model ZP200 




X10 OSCILLOSCOPE PROBE 

200MHz monolithic probe provides superior 
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MiiilelZ1S420 



ESD FIELD 
SERVICE KIT 

Kit includes a blue statlc-dlsstpatlv« vinyl work 
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one adjustable wrist strap with a 1 megohm 
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$109 



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Mod e j Zeis 
BKPttECtSKJN 

HAND-HELD 
PARTS TESTER 

This 2000 count, 3V? digit LCD 

display meter tests capacitance 

(20mF), resistance (20Mn), 

transistor hFE, SCRs, diodes, lEDs and batteries. 

Comes with 9V battery, manual, test leads and 

1 -year warranty. 




$24.™ 

Model ZP81 

AUDIBLE 

CONTINUITY 

TESTER 

Tester gives a clear audible sound on point-to-point 
continuity and is suitable for Go/No-Go test for 
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etc. Complete with test probes and detachable 
r clips. Operates on 9v battery (not incl.). 




ui 



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Model RRMS225 



Bmckman /nduatrial 

4 DIGIT 

TRUE RMS DMM 

• 0.25 % accuracy 

• 41 segment analog bargraph 

• 3-year warranty 

FLil-function, auto-ranging DMM witti 4 digit, 
1 0,000 count resolution measures DC wltage 
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relative mode and a probe hold mode. Comes 
connpiete with manual, test leads, battery{9V}, 
and protective tiolster. 




$109. 



DO 



$129. 



00 



Reg .$139."' 
Modet R380912 



Reg.$159.<" 
Model RSeogiF 



DCA/ACA 
CLAMP METER 

Functions as 3 1/2 Digit DMIVI 

Transformer jaws measure up to 400A AC/DC 
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resistance. Ttie meter lias the following 
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DCWACA; 20OA,400A; Resistance; 2000 ohms 
Resolution down to 0.1 mV, 0.1 A and 1 ohm. 
Comes complete with test leads , battery, 
carrying case and 1 -year warranty. Model 
R3809tF also has a built-in temperature 
function, 0-1400°F. 



*p3«li 



95 



Reg. 580.*= 

Model RIMS Tool Case 



$299.00 

Regular Saes." 
R22-IM5 117 PC. Tool Kit 





THE 

PROFESSIONAL'S TOOL CASE 

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• Two removable pallets bold over 60 tools 

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$149,'»Reg.$183.» 
Model ZC2093 

SERVICE VACUUM CLEANER 

Features a powerful 2.2 peak HP motor, easy 
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a 6' Tuflex hose, dusting brush, crevice tool and 
brush, tube adapter, snorkel tube and small 
dusting brush. 12"x11")(5". 8 lbs. 




$99.* Refl. $128.«= 

Model RWTCF^ 

TEMPERATURE 
CONTROLLED 
SOLDERING SYSTEM 

Widely used in Industry. It maintains a 

constant tip temperature of 700°F. Grounded tip protects components from 

voltage spikes. Comes with power unit. Iron, stand, sponge and 700°F tip. 




$49.''° RBfl.JSS." 
Model ZP1KS 

BUTANE POWERED 
SOLDERING TOOL 

With cordless convenience this 

4-in-1 soldering tool converts from 

a solderingiron to blow torch, hot blower or hot knife. Butane gas powered. 

Complete with tips, sponge. Iron stand and carrying case. 




$49.^ 

Model 27201 F 

DIGITAL THERMOMETER 

Measures 0° to 159°F, hasa hi-lo limit setting, an 
accuracy of ±1 ° and a built In clock function. ABS 
covered probe Is suitable for air/immersion applica- 
tions. 1.5V battery incl.4oz. 




^ 
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In MA: (508) 682-2000 



anCLE 227 ON FHEE INFORMATION CAM) 



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20,000 12VDC/100MA 
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76«J ea/5000 
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13,500 HIGH QUALITY 
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(FAX 514-345-8303) 



CIRCLE £71 OK FREE INFORMATION CARD 



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Our Name says quality, service and dependability - 
Our customers agree! 

"The best part of the Optoelectronics LCD counters are their 
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even in bright sunlight and the rugged construction allowing 
them to get banged around, but still continue to operate smack 
dab on frequency. . . Yours is the only counter which reliably gives us 
(at Radio School) an instant frequency readout with its rock-steady 
LCD digits featuring incredible IHz resolution. " 
Gordon West 

Optoelectronics has satisfied its customers for over 18 years - 
See for yourself what countless 
others have already discovered! 



FACTORY DIRECT ORDER LINE 

1-800-327-5912 

(305)771-2050 • FAX(305)771 -2052 

5821 N£ 14lh AvBruB • Fort Uuderdala. FL SW34 

5% SJlippi™ Handling. (Maximum S10) U.S. S Cinacla. 16% ouUWe 

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encourage 

by one ofmy^ 

readers words 

of wisdom, 

and bought th 

Model 2300. 

Your service wa 

Kt ^^""^"---^ superb! After 

m lesting thin unit-l] 

personally feel that all serious 

radio enthusiast.'! should own an' 

Optoelectronics Frequency Finder 

tRon Bruckman 
, Radio Monitors Newgletter.l 

Of Maryland 



M«i>l 


0030 


3000 


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2X1 OA 


2300 


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Frequency 


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1MHz- 
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lOKi- 
3,00 Hi 


IMHi- 
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lOHl- 
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IMHi- J 
2.4QHI 


Dfsplay 


10 Digil 
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lODign 
LCD 

w/Fundion 
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lODigiv 
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1001^ 
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CIRCLE 259 ON FREE INFORMATION CARD 



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Computers, Components, Tools And Supplies 



Debco Electronics 

4025 Edwards Road express order line - 1 (800) 423-4499 - orders only please 
Cincinnati, OH 45209 technical support / information - (513) 531-4499 



74ll 

7400 

T.«S 
74« 
7«7 
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7414 
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74LS04 
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74£SlEe OS 

74LS15T 47 

74i3lS0 30 

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74LS161 52 

74tS102 OS 

Vim % 

74LS105 76 



74L^22 
74LSK4 



741.S62S 
74LS040 
74LSe41 
74LS«43 
74LSa4S 

74i.se4e 

74Li«60 
74LS6e9 




74S11J 
745113 



745250 
74S« 
74S200 
745203 
74SO7 
74S373 
745412 



74HCr5 
74HC05 

74HCo« 
74MC03 
74HCig7 
74*10108 
74MC112 
74HC12S 
74HC132 
74WC133 
r4HCl38 
74MC130 
r4MC148 
74HC1SI 



74HCieS 
74HCieO 
74riCl74 
74HC17S 
74MC103 
74HC11H 
74HC19S 

V^ ___ 

74HC241 .00 

74H042 si 

74HC243 ,70 

74HC244 M 

74H(S4S .IS 

74HC251 65 

74HC2S7 i/» 

74HC2SS .69 

74HC259 09 

74H0273 .02 

74HC2W -82 

74HC200 1,72 

74H(5307 .60 

74HC365 69 



4HC46H 2 IB 
4HC4530 too 



74HCTn4 
74HCT00 
74HCT10 
74HC711 
74HgT14 
74HCT20 
74HCT27 



74HCT123 SO 
74MCT125 89 
74HCT138 59 




74HCT245 .00 

74HCTZ51 .92 

74HCT257 79 

74MCr25B 79 

74HCT|^ 59 

74!SSt3S7 00 

74HCT30e .05 

74HCT373 09 



4020 
4020 
4030 
4034 
4035 
4O40 
41H1 
4042 
4043 
4044 
4045 



4049 
4000 

4052 



407i 
407: 



40SO 
4070 
4071 
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173 
4075 
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4077 
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4082 

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4500 

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4508 

4572 

4561 

4582 

4584 

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4702 

4^4 

14174 

14175 

14409 

14410 

14411 

14412 

14419 



1.10 
1^ 
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.79 
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350 
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2,00 
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90 
1,60 
1,00 

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.79 
9,95 
1.1s 

.60 

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12.95 
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995 
6.95 
4.95 



14433 
14+51 
14490 
14497 



Lha07 

IJ430e 

UbOOaH 

Ui»09K 

UMt310 

LM311 

LM312H 

U015 

UOITX 

DMIB 



LM302 
LM3&3 



1J«67 
KE57D 



JS02 

LU709 
LM7l5 



,79 
3.25 
2.69 
2,69 

,79 



LM71 

LW711 

LM723 

LM723H 
LM733 79 

LM741 .30 

[IU741HC 1,40 
LM747 ,79 

LM74S .79 

LM1014 
LMIOOO 
LM1310 



2,60 




LMieOO 2,69 

1.M1812 795 

DtllKM 

LU1071 

LM1072 

LM1877 

LM10S9 

IMIOO8 

ULN2001 



0,95 
7,96 
3,95 
3!S 



,70 
IJLN20a3 .re 
uCN2054 .79 
X^M6 525 
XFttW? 4^ 

XH22oe 3.2s 

X^l 1 3.30 

XR2240 250 

XR2242 ISO 

XR255J 2,50 

LM2aOa 2,19 

LhCKIl ,89 

LM2907 2.69 

LM2917 2.19 

CA3018 1,50 

CA3037 1,50 

CA3039 2.58 

CA3046 ,90 

CASOSO 3,20 

EJ^ ?:^ 

CA300D 1,10 
,7B 
1 18 
1,19 
.99 
1,69 
1,70 
,99 
,89 
■39 



CA30ei 

aufi82 

CA3a83 

Cuooe 

CA3130 
CA3140 
CA3148 __ 

CA3ieO 1.19 
CA3162 4,00 
"^^3183 ,99 
:A3401 ISO 
75 
1,60' 
1.99 



UC3360 1 50 

MC3J73 1 70 

MS401 Sh 

UC3Ka ,70 

!!C3487 2l5 

LM3900 ,80 



m i^ 



UC4741 

NDUena 



TfUNSI«TOBS 



2S 
1.95 
1.15 
1.00 



S(i'& 



D42C8 
BFie7 
3N2D0 

cxean 

J310 

UJE340 1.00 

inF3S3 0.25 

inF541 — 
SNOOT 



S.60 
1.00 
.75 



»^18 
UJIOOO 

NIE0213II 



3.00 
.70 

1.50 
.25 

1.50 
50 



PH22Z2 


20 


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TMRSOD 


1.00 


gjgg? 




KHSm 


,i(J{ 


2fl30fi5 


65 


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40 



2N3S87 55 

PN3043 2h 

2N3772 1 09 

2N3aO« 1.20 

2»«S 30 

2KMa4 20 



2N3e08 



2W123 .30 

2N4124 30 

2N412S .30 

2N4220 \M 

2H*Z» 150 

2144240 1,M 

2N43S5 SO 

2W4401 30 

2M4IS M 

2N4403 30 

»M424 X 

2M4857 1:10 

2N4010 30 

2»«48«2 .25 

2NS0a6 X 

2!ei00 1,50 

2t«222 35 

2»«3M 50 



.35 

600 
2,00 



2NS464 
2N5S50 
2N5at9 
2t«840 

JttSiTS _ __ 

2M5078 249 

2N6037 45 

2Ma43 1,05 

2N6045 1.8$ 

2N6107 1,10 

2NC124 1,00 

2N82S1 4,00 

2H^i2 1 li 

MPS6613 20 

2N8719 50 

kUt10a2 ]M 

M 14000 226 

40340 .50 

4043S .50 

UPSA-DS M 

MPSili-0« Jo 

MPS*- 13 SO 

M^SUz 35 

MPSA~43 38 

M!>SA.e5 ,15 

MPSX-TO .15 

MPSA.92 40 

MPSA-93 .40 

tlP20 .70 



T1P30 
TP31 

TIP32 

TiP4a 

TlPlfc 
P1 10 
T1P1 12 
TIP122 
T1P12S 



SO 
,59 
,59 
,«9 
.05 
95 
120 
.00 
TO 
70 



Tll>141 
TU>148 1.B9 

Trp20S5 199 



C 

2 



BRAND NEW 
ZIPPERED 
LAPTOP 
BAGS 



These padded nylon 

bags are idea! for 

many types of laplops, 

toots or portable 

instruments 




BAQ (24 < 13- I S.6* X SJ* 

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s*Qne- 12' J!8•^4J■ 



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eAQ 137 - ir 1 14- I »- 

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Overstocks and Special Deals... 

Tnn>li(<n 8 DtodH 

PK2222 OP NPN ..„.., HVIOB 

1M100S 800 PIV 1* 20(1 00 

1N4446 SJml _„ 2(V1 .00 

200 VoH tf lA 2X^1 ,00 

lOOOVtifl O 1A „ „ IVIOO 



CryBtAt OtcAlalor* 

14 112 MHl Cevtl^t Ok. - -, 2.00 

32 UHi Crfstil Qk ..„_..., 2.00 

SoeitvU. Phigj.. vtc 

40 P*i, Low Pra JC Sodwl ..^-..^v, 0.15 

Oa25-P. RA PC Mount _. O30 

34 Pin 2 Row Pittan IDE 0.4O 



TiniH ind condlbona Q< u^j (NO MIM1MUM OnOEni> ■ Mail am ttt^Tt la Vitxo Bee^vrk*. Itc. 
4025 EdMnk fVi«d, Cncnvib, Oho 45200 or cal, lol-frH ■ 1 (800) 4^-4480 tf (513) 531-4400 - We 
KHxpt cull, chtdiM. mmrt ordHm (U.S. lundt only], VIS*. DISCOVER tnd Ualarota - UPS grgund 
■h^ipbiji- $5.00 IM. b. ■ .50 hOi KkDUmil lb •2ik{ [}>rAK-$SEO 111 lb > 1.50 «*cn add - NkI Day 

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COM-3 



2 WAT RAHiO 
SERVICE MONITOR 

4°3, Ihl wertd'i nio*t popuiv IcwflO*! »rv»cc rrwrt- 
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^mgriinmBU* mtmoriBt -Ouiput Htocten in voti. d6, 
d6m wrth munt co nwf i ton bttiMan unita 'RF ouiput 
nvflna ppiw prcMcwd «LEt} dit^y ot ad pvanw- 
l«n— ivp aruloo guHtworVi 




^ liit'gMr lof ov«( 1 D y« vt And I* rengnlxiKJ tDf 
b if.itfl^i pnxkxHft al iyeokthniuQh pricaa. Al at 
'eourHn Uny « tuN ai>t")«Ar warrantv on putt 
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muUclvrcr o' lD««.f>at cmjnt«r$ In thfl tntkrv 
3J^.C(rnilarB'i(»cil>CiKrjCini. DurcxMjnton ira Ui- 
lEUffld. (rom sm4io to UHF, tvilh FET fiiflh 
3MU/10C Ijiput. prc^r Ml.'w 3h«pvto circuHrjif, tnd 
nllU hliQih guilriy »0OTy Qlm Crf^ftCi-thru PC 
vdcontfrucUon Muf*it|;n'*lOC»^rrnnij<jiclWffd 
UhiV U .S.A. Atf counlBTB Ibaj ufo I ppm accuricy. 



NEWCT-25fl2.5GHl 



ACCESSORIES FOR COUNTERS 

Ttl9*CDplc «hip ifrivrvu^aMC ptuig- WA-IO (T 1 96 

hfpgh mpaduioa proba. Itght b^«V, MP-1 ttfi.-^ 

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DimCI proU. garwal purpOM lob. OOI J1fl.9& 

fil b*l, «l»rlU«£OiPit»r for*UyV*wW>(], Tfii-TQ t9 9^ 

RvdwgNtM <niiirn«i buntrc pKii. &P-4 t Q 1^5 

CT-SO Dvmi EirrwdMa, 0. 1 ppm iccunCv, OV-l M 9i 



Aii COUNTERS ARE FULLY WIRED & TESTED 



SdIl 



^■50 






CTJSO 



PS toe 



FREQ. RANGE 



20Hi^6ffl)Urt/ 



20Kz-&»Uh{i 



l(JHs.«O0WKi 



lOHi-i aem 



1<IHl-2saHl 

rmkaiivSoaHz 



ID UHz-1 & CaHj, 
dnrtdi trr tffi» 



^^M SPEED RAOAR 

^^W SB9.S5 

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"t4r*,||liO«|tK!*», 



SENSlTlVtTY 



< 25 mV to 500 MHr 



'- M mVtolSQMKe 



10 mV to ISO UHc 



<£SmVtD'»UH£ 

<t5mV»5WMKi 

■clQOmVlOlQHr 



-:J5flnVto50MHl 
<lOniVt9lGHj 
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• cms tor vid*rvii (xt kidu<)«d> 
idrvnton 12 VDC EuyHiExiikl— 

1 lor t prO(*Uik>ndJ look Av«rvLJ»- 



BCBOWAVE 
OnJStOM ALAfW 

r«a] micrcwAV* l!>Of)pt«i' 

Un ■* IV U 10 lM>r BWAy. 

>p«fi«n wi 1 .3 GhU.. *nd 4 
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^OWd.runson IS-VIX: 

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ofU' 400-aoCO Hf M^ 

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wK Mnoc FSK. IK 

EMUtttiCO^ Rkmgn 



TICKLE 3TIK 

A tfAdtu^ ^Jtl BlHit- 

m^ LEO mtlr*dt. tx 
Eimt U pick up nnc' 
CIrtMookking Can— 
you WAtcK Iha lunl' 
IdUf lor olTv* dHl4. 
piu1m>, noHy ii4%o#' 



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DIGITS 



flESQLUTIQH 



IH1, I0HI.10CHJ 



01 Kl.lQHLlOOHl 



01 Mi. iKtTOMi 



0.-» Hi; 1 Hi. ID Hz 






BtlOADBAND 
PREAMP 



Ifr-.-Ji- 



Booftt those MreiLk. »>gn4la l>> T^i'ii' 

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erf vpMlwr vOtuma. Hu<u on -iV tAUitry V*ry 
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Id your dnw home' 
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CABLE CONVERTERS 

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HOSFELT ELECTRONICS, \WZ.m 



MAX232CPE 




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BARRIER TERMINAL 
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10 AHP - 

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3 

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10 

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BIPOLAR 

HALL EFFECT 

DIGITAL SWITCH 

Mfg - Sprague 
Hfg t - UGN3030U 
Low Profile Package 

4.5 V to 24 V operation. Output 
cotnpatible Mith all digital 
logic. This Is a magnetically 
activated electronic switch. 
Spec sheet Included. 



No. 25-137 



$.49 



MACHINE PIN 
DIP SOCKET 



PART # # PINS MIDTH PRICE 




21-104 
21-131 
21-118 
21-123 
21-142 
21-103 
21-124 
21-U9 
21-121 
21-192 
21-120 



8 

14 
16 
18 
20 
22 
24 
24 
28 
32 
40 



.3 

.3 
.3 

.3 
.3 
.4 
.3 
.6 
.6 
.6 
.6 



$.35 
$.40 
$.45 
$.50 




LOW VOLTAGE 

TRANSFORMER 

TIMER 

® 

Input: 116/125 V, 60 Hz" 
Output: 12 V. 60 Hz, 72 VA (6 A) 
Photo cell sensing 3 mode; Full 
automatic 'On' at dusk, 'Off 
at dawn; Autoraatic 'On' at dusk, 
'Off at a predetermined time 
(max 12 hrs); Manual 'On' and 
automatic 'Off at dawn. 
MO. 56-199 $18.95 



]Z21i 



50 
SS 
60 
60 
65 
95 
75 



6 VDC @ 2 AMP 

Hfg - Seiko ""'*' ''"' 

Mfg # - DPU-411-01 

3-3/8" X 2-3/8" 

Input: 120 VAC 60 Hz 30 M 

Output: 6 VOC @ I amps 

The enclosure and the 6 ft. wire 

AT^ black. The wire has a white 

tracer. Center Is negative for 

polarity. Coaxial plug: 0.0. - 

.215", I.O. - .079". 






No. 56-185 



$7.95 



PROJECT 
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SOLDERABLE 
PERF BOARD 




Heavy duty 3/16" molded plastic 
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2-11/16- X 1-11/16" X 1-13/16" 
No. JU.-1 $1.35 

3-5/16" X 2-1/8" X 1-3/8" 
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4-1/8" X 2-3/4" X 1-9/16" 
NO. JAL-3 $1.99 

5-1/4" X 3-1/4" X 1-9/16" 
No. JAL-4 $2.75 



Perf board with mounting holes 
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Boards have holes on .1" matrix 
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POWER 
TRANSFORMERS 

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12V CT. lA (6-0-0) 

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No. 56-192 $5.95 



1-1/2" X 1-3/4" Fits JAL-1 ene 


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Ito. JAJLPC-1 $.59 


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No. 56-193 $8.95 


1-7/8" X 2-1/4" Fits JAL-2 enc 




No. JALPC-2 $.89 


24V CT, 3A (12-0-12) 




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2-1/2" X 3-1/8" Fits JAL-3 enc 


No. 56-194 $9.95 



No. JALPC-3 $1.25 

3" X 4-1/4" Fits JAL-4 enc 
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i^:sw Manuals available at extra cost 




INDUSTRY STANDARD 

TEKTRONIX 491 
SPECTRUM ANALYZER 

Covas 10 Mhz -40 Ghz. Solid slate portable unit 
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with purchase of each 491 forS200.00 extra per set 
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R390A RECEIVER 
"The CLASSIC RADIO RECEIVER that is 
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complete with meiers and cover ihe frequency 
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direct frequency readout via mechanical digital 
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Price: Used Repairable $295.00 




R1051B RECEIVER 

Covcis 2Mhz - 30 Mhz LSB, USB. ISB, AM. CW 
& KK Navy Shipboard Design. Direct Frequency 
readout. Accurate HighStability Tune Base. Requires 
1 15V AC 60 Hz for operation. 
Price: Used Repairable $45000 




RECEIVER RADIO 
AN/URR-71 R-151S/UR 

This rugged little radio with solid cast ahmi case 
is catunly built for ruggednras and scx^^pcal. 
Frequency coverage is 19.0Mhz to 357J5Mhz 
in two bands. Sensitivity is l,2uv for AM&FM 
and 0,4uv for CW. Bandwidth lOKhz m 75Khi. 
Two switch selectable ant inputs are movmled on 
the fifom and rear panels. Power requirements 
arc Intcmalbaltcry (12BA 3030 1 .5 volt D cells) 
or AC 1 10/220 vac operation 5&400 Hz, This is 
a very lavique radio with many other features and 
certainly not one to be misscdl ! ! 
Fric«: $325.00 ea. Manual : $20.00 
Box of 24 new alkaline D-cells $18.00 




FUNCTION GENERATOR 

Features rugged design, .01 Hz - IMhz, DC 
Offset, Pulse Width, Sine Square Triangle & 
Ramp Output and much more - an excellent 
value. Requires case. 
Price: $99.00 Checked 



*** All Prices In U.S. Dollars 
Please Include telephone/fax 
number with mall-ln orders. 
Orders must be prepaid by guar- 
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467 SIMPSON 
DIGITAL VOLTMETER 

Top quality American made 3 '/^ digit DVM 
with many features including; Digilog^** Scale, 
+/- Peak Hold, Diode Test and TRUE RMS. 
Comes complete with carrying case, external 
current shunt and 5000 volt probe. Require 9V 
battery. 

Price: Like New $165.00 

Used Repairable $ 99.00 




MARCONI SYNTHESIZED 
SIGNAL GENERATOR 
Req range gOKhz-520Mhz with calibrated out- 
put levels &ora -127 dBm to -FlSdBm. Resolu- 
tion lOHz. It can be freq. phase or amplitude 
modulated from ext or int modulation soiirecs. 
RF ou^ut resolution is O.ldB. rcversepower 
pro tec tion of up to 50Wis possible without dam- 
age to the instrument. This instrument is micro- 
processor controlled and very easy to use, a 
must for any serious repair or development iab. 
Prfce : $1500.00 Checked 




COLLINS KWM-2A 
TRANSCEIVER 

A classic HAM 1 OOw trancetver. These units are 
true to the classic collins style and quality, built 
to last more than a lifetime. Guarrantecd to 
please any collector. Limited quantiQ' Ml 
Price: $595.00 with piggyback pwr-supply. 



60A14 



CIRCLE 291 0« FREE INFORMATION CARD 




FREQUENCY COUNTERS 



_„ RANGE ■ MHZ 

til AX 1400 'K» 



MOOEL 75-OG 



„;GHS£NSmVriY»-5GHZHFC0UmSI 

/500.D0D0 



ULTRA HIGH SENSITIVITY 
RF DETECTOR - COUNTER 
S INCH LED BAR GRAPH 

Regular SSSO. value II 



$169. 



»TAI*TBK»«B^ 



,TOHM.*^ 



■yuwo"'^** 



BTARTEK Bar Graph counters are ^mpty the beet for 

finding frequencies, testing, adjusting, repairing or locating 
RF devices. Superior sensitivity, tonger battery operation, 
high quality USA construction and sut)-compact size are 
just a few of the reasons to select, a sTAnrmK counter. 



SPECIAL LIMITED TIME OFFER 

PLEASE MENTION THIS AD FOR SPECIAL PRICE 

STANDARD FEATURES FOR ALL 6 MODELS 

3 to 5 HOUR BATTERY PORTABLE OPERATION 
NIOAD BATTERIES & 110VAC ADP/CHARGER INC. 
1 PPM TCXO TIME BASE WITH EXTERNAL ADJ. 
3 GATE TIMES, AUTO DECIMAL PLACEMENT 
HOLD SWITCH (WORKS PROPERLY- NO GATE CHG) 
9-12VDC AUTO-POLARITY POWER INPUT 
StarCaJb" QUALITY ALUMINUM CABINET 
COMPUTER AIDED CIRCUIT DESIGN 
TOP QUALITY COMPONENTS - SOCKETED IC'S 
COMPATABLE WITH MFJ-207/2CI8 ANT. ANALYZERS 
FULL YEAR PARTS & LABOR LIMITED WARRANTY 
DESIGNED & ASSEMBLED IN THE USA 



ACCESSORIES: 

#CC-90 BLACK VINYL CARRYING CASE $12.00 

#TA-90 TELESCOPING BNC ANTENNA 12.00 

#P-110 PROBE, 200 MHZ, 1X-1 OX 39.00 

#W207IC CABLE FOR MFJ-207/208 10.00 



f 



SAME DAY SHIPMENT 

Orders & Information 
305-561-2211 

Orders only 
800-638-8050 

FAX 305-561-9133 



FACTORY 

DIRECT 

ORDER 

LINES 



VISA 



STAHTEK 



INTERNATIONAL. INC 



TERMS: 



398 NE 38th St., Ft. Lauderdale, FL 33334 



charges for Fionda add $4 + tax, 
■ S10 max), others add iscws of 
total, CCX) (»e $+. VISA, MC or DtSCOVER aocepled, Prices 
& specMtcatkirHr siiitect lo change without notice or obligation. 



ShippJno^ianiJJng 
US & Canada add 5H ($4 mJn 



^ 



SELECT YOUR STARTEK POCKET COUNTER" TODAY ! 



NEW LOWER PRICES 



,j„ «•»•«'««"■ a.m 



iBDaoDoa tsaaooon ^^oaoDon 



JSoooooDJ '^ooDona ^^onoooa 



.^ A 









f 
I 



13SO 

1 MHZ- 1300 MHZ 
QUALITY 4 ECXIMOMY 

$129 



1B-UHS 

1 MHZ-ISOCI MHZ 

ULTBA WQH sewSfTMTY 

(FEPLACeS tlKWHS) 

*$159 



ssaa 

10HZ-3WO MHZ 

H^Z INPUT - LO HMoe 

HWH SENSmVITY 

*$189 



3saa 

10 HZ -9600 MHZ 

WZ WPUT . LO RWQ6 

HIQH SENSfTMTY 

$250 



1H-BQ 

1 MHZ -1600 MHZ 

LPLTFW HQH SENSmVTTY 

2INCH BAR GRAPH 

$SPECIAL$ 



3B-Ba 

1 MHZ - 3200 MHZ 

ULTRA HOK SE^ratTIVITV 
a INCH SAB QHAPH 

$265 



CIRCLE 290 OH FREE INFOflMATION CAflD 



ID 



60A15 



B. e. MICRO 



SPECIALS 



MAX232 
148B . . . 
1489 . . 
DB25-(Solder Cup) M/F 



DB25-R1. Angl* PC BO. F . 
Dfl9-ni. Angf PC BD. M/F 



FANS 



12VDC - B ruth lets 

Manulaclursd by Comntonwutlh 

Model FP 108D-7 Blades 

3 Wire Leaiis- 1&DMA 

3'fi" Square - 1" Thicl! 

This iize CDmmonly used Jn 

compuler power supplies. 

$6.95 ea. 



DISPLAY DEVICES 



r~ 



FLAT PANEL LCD 
GRAPHIC OISPLAV 
EPSON EQ-TDD45-AR 

Ud I i&6 tfnli - iufwr twli1*d ninutlc lyp* 
auW m arlv4fi - 4 bit TTL lnl«1i<« • CipiU* et 
ribptigrlnf nufntrtfi, gra^Mci, aEpht^lkea, ip*tl*l 

10-7rT*'«4'J.1'.OTW*li1l'3^'K*-1/l*- 
14 pMi tor ilsnatM me p9w>r (*iV. -laV). 

%M.ai «/tioo.[>i] 

LTP 11S7AE 

1.2' SiT Milrli Dlipliri 

5x7 Array wlUi x.y salbcl. 

thki Rtd Orvng* Mitrix Can Ba 

Sladwd Horizontally. Cholca ol 

Two Matrix OrlaniatloFvCi^lwdt 

Column, Anod* Row. Grttc For 

"Moving Matiagf" SlgnJ- 

$1.ta E».. 8/$a.B5, HKI/t75.00 



LSOD 
LS01 
LS02 
LS03 
L504 
LSOS 
LSOS 
LS09 
LS10 
LS11 
L$12 
LS13 
LS14 
LS15 
L520 
LS21 
L322 
LS26 
LS2T 
LS2e 
LS30 
LS3Z 
L&33 
LS37 
LS33 
LS4Z 
LSS1 
LS54 
LS5S 
LS73 
LS74 
LS75 
LS63 

Lsas 
Lsse 

LS90 
LS92 
LS93 
LS95 
L$96 
LS10T 
LS109 
LS1 12 
.S1 13 



.14 LS114,2S 
.14 LS122.35 
.14 LS123 .45 
.14 LS1Z41.35 
.14 LS125 .30 
.14 LS126 .35 
.14 LS132 .35 
.14 LS133 .25 
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.14 LS13e .35 
.20 LS139 .35 
25 LS145 .75 
LS149 .35 
LS151 .35 
LS153 .35 
LS1S4 .85 
LS155 .50 
LS1Se .42 
LS1S7 .30 
LS156 .25 
LSI 60 .25 
LST61 .35 
LS162 .45 
LS163 .36 
LSIM .45 
L51B5 .60 
LSI 66 .75 
LS169 .90 
LS170 .45 
LS173 .60 
LS174 .35 
LSI 75 .35 
LS1B1 1.25 
LS191 .45 
LSI 92 .65 
LS193 .85 
LSI 94 .40 
LS195 .52 
LS196 .SS 
LS197 .75 
LS221 .50 
LS240 ,50 



L&241 .GO 
LS242 .85 
LS243 .50 
LS244 ,55 
LS245 ,55 
LS251 .45 
LS253 .40 
LS2S7 .35 
LS258 .45 
LS2591,0O 
LS26a .40 
LS268 .30 
LS273 .75 
LS279 ,30 
L$280 .80 
LS283 .35 
LS290 .70 
LS293 .50 
LSZ93 .65 
LS2%1.00 
LS3221.3a 
LS323Z25 
LS348 .75 
LS3531.00 
LS35T .80 
LS363 .75 
L$364 .75 
LS365 .30 
LS366 .28 
LS367 .35 
LS368 .30 
LS373 .50 
LS374 .45 
LS375 .35 
LS377 .75 
LS37S .80 
LS390 .80 
LS393 ,75 
LS3991.00 
LS541 1.20 
LS645 .75 
LS646 .75 
LS670 .80 
Z5LS2SB9 1.50 



SUPER BUYS 



DTMF 

SSI-202 Decoder 2.2S 

8870 Decoder 2.25 

5087 Generator 2.00 

5069 GerierB»or 2.10 



THE $25 NETWORK 



Try Tht Ui Truly Low Coti LAN 
< Connect 2 or 3 PC». XT», ATi 
> U«M Mi'Ltl porta And S wir* 

cabl« 
<Runs It 115 K biud 
a Runt In backgroundK totally 

tranip«r«nt 
i Shira any davlce, any fEla, any 

llm* 
i>N»edt only 14K ot ram 

Skepticaf: W9 mak« boU«vortI 



LITTLE BIG LAN 



Lew c-Da1 - t7S< p4f LAN, n^i p*r nt}ti*\ 
■ HAPdWirt l>Hl»p»ndrnE nitmrorh 

A^CMet. Pvativi. ind i«nti poH 

Pu^orE er> 1tri[ r*tiiA<* 

filKtiF Sp««{t SKOiXTt'tVXKATt brtw 

Pmtiitl Sfi*«4 tOO04n>3WODfAT} bjlM 
gv ttcond 

AACM^T »p««a 4KKn piui bviM e« 

■ KdAd 
< U» attf PC/XTi'AT.'3«t mtv; tvitfi Iipl4^ 
tnd PV/1 iHJKh^M 

CofifWKiup lo iH compvlm. cifl ml* 
cwifircHAn miilhed* 4S«-r1«l. PvidtH 
A/cntl) 

• DOS FH* ind Rihcorrf Ichchtng lupp^rt 

*■ Shaft ih]^ drrlci. Miy Hit, any puf^rtm 

• Rum kn \ht btcttg/ou neH. lo^ilfy Utntpttwryl 

• Low mtniwY ontrhatd 

Trpfcallr (mly IIK li nttdfds buE will 
Vtrf Wl1h Wioui tttupi 

• Wctk« 411 h m04l (anvvtrt. including DBASE 
111, uic!roi-&ri 

WORD. LOTUS MX Wkitfowi X 
AUTOCAD, Ward PadtcL ^ cempllarm, 
OWBASIC. ara. in tKl. mHl •n^lhtnti' 

• WfirlUifflthDai 2.0 16 DOSS, d and Dft- 
DOS 

DOS 3 1 or prttltr ti prtFtrrtd 
« Opin network, pn^tmm*t AM pfovldid 
Exwrpla loir ]ow-i«vt< Unit, rrvukikti — - 
you cvi luppdrl tpvdai hH-d>tt«i 
Full iptci provldtct on ptcttl livtl 
pfoiacoit 
CABLtS « ARCHCT CAflDS *__ 

AVAHABLE - P LEASE CALL ^fO* 



SOCKETS 



Low Profile SOLDER TAIL 

6 Pin 14/1.00 

8 Pin 13/1,00 

14 Pin 13/1.00 

16 Pin 13/1.00 

18 Pin 13/1.00 

20 Pin 13/1.00 

22 Pin 13/1.00 

24 Pin 8/1.00 

26 Pin 7/1.00 

40 Pin 7/1.00 

BUY $10 

SET $1.00- FREE CHOICE 

66 Pin PLCC ,79 

64 Pin PLCC .69 



6500/6800 


6502 


2.O0 


6821 


1.00 


6520 


1.25 


6845 P 


2.20 


6522 


2,70 


68455 


2.20 


6530 


3.00 


6850 


1.75 


6532 


4.25 


6652 


3,50 


6545 


2,10 


6860 


3.95 


6551 


2.40 


66661 


3.00 


6800 


1.40 


68A09EP 


1,29 


6602 


2.50 


6aA40 


4.00 


6803 


3.00 


e8A54 


3.0C 


6805 


2.95 


68B09 


4.00 


6609EP 2.75 


6SB10 


2.00 


6S09P 


2.50 


69B45 


4.95 


6810 


1.25 


6SB54 


4.00 



P. 0. Box 280298 (^liias. Uxat 7S228 

(214) 271-5546 
FAX (214) 271-2462 




TEXT TO SPEECH BOARD 



PC/XT COMPATIBLE. MAKE YOUR COMPUTER TALK I 



ASSEHBLEO I, TESTED 

ADD U.SO SHtPPINQ 

t HANDLINQ 



A VERY POWERFUL AND AMAZING SPEECH CARD. USES THE 
GENERAL INSTRUMENTS SP02S6-AL2 SPEECH CHIP AND THE 
CTSZ56A-AL2 TEXT TO SPEECH CONVERTER. 
THIS BOARD USES ONE SLOT ON THE M0THEB8OARD AND 
REQUIRES A COM SERIAL PORT. BOARD MAY ALSO BE USED IN A 
STAND ALONE ENVIRONMENT (EXTERNAL POWER SUPPLY) WITH 
ALMOST ANY COMPUTER THAT HAS A RS232 SERIAL PORT. TO 
USE THE BOARD IT IS ONLY NECESSARY TO SEND ENGLISH TEXT 
TO THE RS232 INPUT ON THE BOARD, THE BOARD INCLUDES A 
1500 BYTE TEXT BUFFER AND HANDSHAKE LINE TO ALLOW YOU 
TO SEND DATA TO THE BOARD: THE SAME AS YOU WOULD SEND 
DATA TO AN flS232 SERIAL PRINTER. YOU CAN SET UP BATCH 
FILES THAT WILL MAKE YOUR COMPUTER GREET VOU WITH 
■GOOD MORNING MASTER." ETC. EVERY TIME YOU TURN IT ON. 
DEMONSTRATION SOFTWARE AND A LIBRARY BUILDING PRO- 
GRAM ARE INCLUDED ON A 5'/. INCH PC-'XT DISKETTE, FULL 
DOCUMENTATION AND SCHEMATICS ARE ALSO INCLUDED, 
FOR INFORMATION ON A LOW COST SPEECH SYNTHESIZER 
SYSTEM FOR THE VISUALLY IMPAIRED. PLEASE SEND FOR FREE 
PACKET T.M.1. 



STANO ALONE POWER SUPPLY 

FOB ABOVE 

ADD Sl.» SHIPPING i HANQLINQ 



$19 



99 



STATIC RAM 



2016-2KX8 200 n.s. 1.00 

ai01-1 -256X4 500 n.s 75 

21L02-1 350 n.s 65 

2102AL-4 L.P. 450 n.s 49 

2111-1 256X4 SOO n.». ,.. 1.00 

2112A-2 2.50 

2114L-3 1KX4 300 n.s 45 

212SA-2 1KX1 70 n.s. . . 1.70 

2147 4KX1 ,.., 1,95 

6116P-4 1.00 

6117 1,20 

6264-15 1.40 

62256 32KX8 5.76 

2108-4 8KX1 1.50 

2116-4 16KX1-5Volt 70 

4027-4KX1-250 n.s. .80 

4116-16KXt-250n.s 40 

4116-16KX1-20O n.s 75 

4116 16KX1-150n.s 90 

4164 150 n.s 49 or 9/3.50 

4164 120 n.s 1.10 

4164-100 n.s 1.40 

TMS4416-16KX4-150 0,». 2.75 

4464-150 n.s 1.40 

4464-120 n.s 1.45 

4464-100 n.s 1.45 

4464-80 n.s 1.45 

41256 ISO n.s. . 1.25 or 9/9.95 
41256 120 n.s. 1.30 or 9/10.99 
4 1 256 1 0O n.s, 1 .30 or 9/1 0.99 
41256-80 n.s, . 1,30 or 9/10.99 

41256-60 n.s 1.8S 

1 Meg-100n,s. 4.40 

1 Meg - 80 n,i 4.40 

414256-60 n.s. 256 x 4 . . 4.60 
SiPPS & SliMMS AVAILABLE 



EPROM SPECIAL 



Wo bought a large quantity of 
270SS, 2716s, 2S32S, 2732s, 
2764s, 27128s, 27256s and 
27512»ffom a computer manu- 
taeturer whio redesigned their 
boards. We removed them from 
sockets, erased and verified 
them, and now we offer the sav- 
ings to you. Complete satisfac- 
tion guaranteed. 

Your Choice 

2708 1.20 10/8.00 

2716 1.75 10/15.00 

2532 2.00 10/17.50 

2732 2.00 10/17.50 

2764 2.00 10/17.50 

27128 3.00 10/25.00 

27256 3.50 10/30.00 

27512 4.75 10/40.00 



8000/80000 



THREE CHIP SET 



B.C. SPECIAL 
16450, 1488, 1489 — S6.95 
16550, 1488, 1489 — SI 3.50 



8031 


2.95 


eOC32i> 3.95 


8035 


1.00 


8039 


1.00 


8085 


1.55 


8086 


1.55 


8087 


67.50 


8087-1 


167.50 


8087-2 


127.50 


8086 


2.20 


8088-2 


3.25 


8155 


2.25 


8156 


2.25 


6202A 


8.00 


8212 


1.25 


8214 


2.00 


8216 


1.25 


6224 


1.25 


6226 


1.75 


6237-S 


2.80 


6243 


1.75 


6250 


2.95 


(16458) 


6.50 


(16550) 


13.00 



6251 

62S3-S 

6254 

8255 

8255-5 

8257 

62S9A 

62S9C-5 

8275 

6279 

6264 

8286 

6267 

6288 

8530 

8741 

6742 

8748 

8749 

8755 

80286-8 PLCC 8.50 
80287-8 125.00 

60267-10 135.00 
V-20-10MHZ 6.50 



1.10 

1.75 
1.80 
1.50 
1.75 
1.50 
1.65 
2.10 
10.95 
2.25 
1.49 
3.50 
2.49 
3.50 
3.00 
7.00 
7.00 
7.00 
7.00 
7.00 



m 

Z 
G 

T 
C 

T 
X 
IT 

rr 

s 

r 
C 



c 

r? 

o 

c 

n 
3 






TERMS: (Unless speeiliod elsewhere) Add S3 25 postage, we pay batance. Orders over S50.00 add BSe for insurance. No CO.D. Teaas Res. add 
8W» Ta« 90 Do;^ Money BacK Guatantee on all items. All Items subject topiiorsale. Prices subjecl to change without notice. Foreigoordcr- US funds 
anif. Wv cannot ship to Mexico or Puerto Rico Countries olhef than Canada, add $9,00 stnpping and ttandling. 



60A16 



ClflCLE 219 ON FREE INFORM ATIOH CARD 



H 



ORPORATION 



CO.Oji 
Acctpted 



1 3406 Saticoy Street 

No. Hollywood, CA 91605 




(818)787-3334 

(800) 235-6222 

FAX (818) 787-4732 



20'^' Anniversary Special 




TEKTRONIX MODEL 511 ON 
(also known as 5103N/D10) 

General purpose, 2 MHz plug-in os- 
cilloscope. Includes 5B13 Time-Base, 5A1S 
Dual'Trate vertical amplifier and 5A23 Hori- 
zontal ampliflefr bVi inch rectangular dis- 
play. Sweep rates from 5 microsoconds to .5 
second per divisionr VerticaJ sensitivity 
frcaml mV to 5 V per division. Add, alternate 
or chopped operating mcKles- X-Y mode, 
within 1 degree from dclo 100 kHz. 

Price: $20«.00 




A.C. POWER SUPPLY 
STACO MODEL ElOlOVA 

This unit has been designed and con- 
structed for rigorous industriaL classroom 
or labtjratory applications, These power 
supplJfe are brand new. Current list pnce 
$75^lte. Spccifkallonst Input: 120 VAC 
S&'MThZ. Output: O-120 VAC 10 amps. In- 
cludes manual with schematics. Features: 
Ammeter^ voltmeter, convenience outlet, 
power indicatorand circuit breaker Dimen- 
slonilO-x TS^xftW^eighl: 22 lbs. 

Price: t»65.0fl 



in 






PAIR 
EIMAC 
4CX250B 
Price: $150.00 




2r * _,i 



TEKTRONIX 475 
PORTABLE OSCILLOSCOPE 

Oscilloscope Dual Trace with D.C. to 
200 MHz response, 1.8 nsec rise time, 
one megohm input impedance, 2 MV/ 
div sensitivity and 1 nsec/div. sweep 
rate. Dual time base, x-y operation. In- 
ternal power supply for external active 
probes. Channel 2 vertical ouput. 8x10 
cm display area. Price: $S9S.D0 




MODEL HP 180A 

Oscilloscope: Mil Spec AN/USM-2mA, 
8 X 10 CM display, 1(X) MHz response 
which accepts standard 1800 series 
Plug-Ins. Includes Vertical Plug In: 
1801A (PL-T186), frequency BW SO MHr, 
maximum sensitivity 5mV/DIV. Hori- 
zontal Plug-In: 1821A (PL-1187J, trigger- 
ing to 1(M) MHz, minirnum sweeptime 
too NS/DIV, has delayed sweep capacity. 
Price: $250.0a 




HP 331A DISTORTION ANALYZER 

Covers 5 Hz to 600 kHz range and measures 
total distortion down to 0,1% (uH scale. Har- 
monics arc indicated up to .1 MHz. Mea- 
sures noise as tow as 25jjtV, and voltages 
over a wide range, 3t» (iV to 300 V RMS full 
scale. Frequency calibration accuracy is :--- 

•5% irom .5Hz lo 300 IcHz; > =:10% from 
300 to sno kHz. Basic voltmeter accuracy is 

^2%. Price; »W5. 00 




I.R, 

TANK 

PERISCOPE 



TypeM-24. Rugged 
military construc- 
tion. Contains two 
independent in- 
frared image con- 
verter tubes plus 
correction lenses, 
pnsjiis, and eyepieces. The binocular view- 
ing system Is directly connected to a prism- 
type periscope. The image tubes have dy- 
namic focus provided by a built-in adjusta- 
ble voltage divider. This unit requires 10 to 
15 KV at low curreiit for operaiion. Unable 
to supply power supply. {Dimensions: 18" 
higti K 9" wide ■< 4»" thick. Weight 17 lbs.) 
Stock #OP 9001 Price: $200.00 




for All Your Electron Tube Requirements 




EIMAC 

4CX350O0C 
Price: $4,800.00 





PAIR 
EIMAC 

4^00A 
Price: $250.00 



THE LARGEST ELECTRON TUBE INVENTORY IN THE WORLD 



o 



CIRCLE 236 ON FREE INFORMATION CARD 



60A17 



*■ ELECTRONIC ^ 
PRODUCTS and KITS 



ft! 

i 
t 




NEW CONCEPT! 

Mystery 

Levitating 

Device 



Hwmmber Waroltfie Worids? objects float in air and 
move to Ihe touch Defies ctra«ty. amaiing gilt, 
conversatKjn psees. magic Irk* oi gfeat saence ptofect- 
ANTIK Easy to A asefflble KM Plans . . . ... Jt9^_ 

Combination Solid State Tesia Colt 
& Variable 100,OOOVDC Generator 

Exptrimmts Using T«sla Coll: 

• Plasma in a Jar.Tomado, Furnace 

• Kiriian Photogtaph/ 
• Wimtess Energy Transmission 

Inckxaion FieWs • PyrotecJinic EflecJs 

• Cwona ana Bnisti Discharge 

■ EnetgiiBf for Neon Piasma Tubes 

Experiments Using Hi Volts DC: 

• Piasma Biasier Dniler.'Cutter 
■ Ami -Gravity Force Fieids 

• Ion Reaction Motors 
■ Lighirifra Generation 

• High Ion Source 
■ Ozone For Air Purification 

• Eiectrifcation of People & Objects 
Particle AcceSetalors/Atom Smashing 

■ High Energy Capacity Charging 

HVM7 Plans Complete System S15.M 

HVH7K Complete System KifPlans S1 74.50 

TCL4K TesIa Coil Only Kit/Pigns mS) 

WSinkC Wall Adapter tor 115AC i15^ 



OparatK 12-19 VK iv 
H*JUM6f115VAC 
Ftf 




Table Top TesIa Coil 

spectacular • 
A Real Attention Getter! 
• 250,000 Volts! ■ 7-10' Sparks! 
Energy even passes througtv 
windows. Great for science 
projects, displays, advertising. 

Highiy spectacuiar devices produces ; 
visible, audible bolts of iighining 
appearing to Hash in the air Causes 
csftairi materials to bum Irom within and glow, lights 
bulbs wnhout vdres, produces inducuon liekJs, St Elmo's 
fire corona. Clearly demonslraies high tfe(|uency high 
voltages yet temiinal may be touched by user during 
(^ration with a metal object 115VAC operaiion only. 
BTC3 Plans . . nS.OO BTC3K KIbPlans $299.50 
BTCM Assemljted and Tested $399.50 




Plasma 
Fire Saber 






PnDduces the spectacuiar effect thai captured the fantasy 
of m nitons o( movie tans. Visible plasma field is 
oonWIed by grip pressure and adjusts satjer length. 
festive energy (ield produces weird S btzan^e effects. 
Excellent for special effects. Specify photon blue, neon 
red, phasor green, or siarlire purple. 
PF52 Plans .... SS.DO PFS2K KlVPIans $49.50 
tjpedal Offer P FS20 Assembled reg$89" . $59,50 

Solar Power Devices 

Build a lence shocker, solar motor, iighi. bug z^jper, bati 
charger etc SOU 4", 2 Amp Celt w,'Plans . . $S.50 
S0L2 Exir, 14 V C«ll *,'Plans $7.50 




Shocker Force Field / Vehicle 

Electrif ier ■ f^at imle device allows you to make 

harx) ario shock balls, shock wands and elaciri^ objects, 
charge capacitors. Great pay badt lor those wise guys 
who have wronged you! 
SHK1KM Easy To Assemble Electronic KH, W4.50 

100,000V Intimidator / Shock Wand 

Module Buikl an eleclncal device that is affective 
up to 20 feet. May be endosad for handheld, portable 
field or laboratory applicaiions. 
(TUZKU Easy to Assemble Electronic Kit , , . $49,50 
JTMZ Plans Only; Credlt-aMe lo Kit $10.00 

Ion Ray Gun • Projects charged ions that irxluce 
shocks in people fi ofejects wilhoul any connection! 
Great science project as well as a high lech party prank. 

I0G3 Plans $10.00 I063K Kll'Plans $69.50 



Invisible Pain 
Field Generator 

Stiirt podtei size e'eciromc 

device produces iini« variant 

complex shock waves ol intense directional acouslic 

energy capable of warding of! aggressive animals, etc, 

IPG7 Pl^ns .... $8.00 iPG7K Kit / Ptans $49.50 



M] 



IPQ70 Assembled 



$74.50 




Homing / Tracking Transmitter - 

Beepe' device, 3 mile range. 

HOpi Plans .... $10. Ml H0 D1K KiUPIans $49.50 

Listen Thru Walls, Floors 

Highiy sensitive stethoscope mike, 

SfJETHI Plans ...$8.00 STETH1 K KlfPlans $44.50 

3 Mile FM Wireiess 

Mike ■ Submlnlalure! 

Crystal deai, ultra-sensilive 

ptdtup transmits voices and sounds 

to FM radio. Excellent secunly system, warns of 

intrusion. Become your neightjorfiood disk jockey! 

Monitor chikjren and inv^ids. 

FMVl Plans $7.00 FMV1K Kit/Plans . $39.50 




Telephone Transmitter - 3 Miles! 

Auiorrtatically transmits both sides of a telephone 
conversation to an FM radio. • Turiai>le Frequency 

■ Undetectable on Phone • Easy io BuikJ & Use 

■ Up to 3 Mile Range ■ Only transmits during phone use 
VWPM7 Plans .... $7,00 VWPM7K KifPlans $39.50 



^)) 



ElectroMagnetic 

_Coil Gun 

e 



S 

I 
UJ 

60A18 



Projects a melal object 

over a considerable distance. 

Become pan ol and perhaps 

contribute tc ttiis exciting new concept af weaponry""^ 

EMU Plans $3.00 EML2K KIt'Pians S99.50 

L — 




INFORMATION UNLIMITED 

Dept RES12, Box 716, Amherst, NH 03031 
Phone: 603-673-4730 FAX 603-672-5406 

MC, VISA, COD, Checks Accepted. Please Add $5.00 Shipping & Handling 



with miny more ftams 
F/?e£ With Order, 
Or Send $1 P&H 




NEW! -~~_ 

Amazing GlowTron! 

Projects visiBe e 
Operates on safe, low voltage to produce spectacular 
lighting eflects. Neon & (luorescents glow wnhoul wires! 
GTRON Ready to IfM $^,50 




TV & FM Joker / Jammer ■ shmpockei 

device allows you to totally control and remotely dismpt 
TV or radk) leceplion. Great gag to play on tamily or 
friends. Discretion required. 
EJK1KM Easy to Assemble Electronic Kit . $19.50 




Visible Beam Laser 

High brightness red HeNe laser visible lor miles 
Produce your own light sJtow! Projects a beam oi' 
red lile deariy visible under most droimstances. Can 
be used to intimidate by projection of a red dot on 
target subject. Also may be used to 'listen in' uiilmng 
our laser winoow acunce melhod #LLISl below. Easy 
to Build Modules Produce A World ng Visible Laser 
LAS1KM Kit w,'1mw Laser Tube, Class II . $69,50 
US3KM Kit wa.Smw Laser Tube, Class IIIA$99.50 




"Laser Bounce" Listener System 

allows you to hear sounds Imm an area via a lite beam 
reflectKl from a window or other similar object. Syslem 
uses our reacfy-to-use LATRI Laser Terminator gun site 
as the transmifler. The receiver section is supplied as 
an easy-to-buiid kit. including our cushkined HSlO 
headsets Order f LLIST20 System, includes our 
LATR1 Ready-to- Use Laser Gun Site, LLR1K Special 
Receiver Kit, and HSIO Head set, «IHw only $2 99.50 




5mw Vtsibie Red Pocket Laser 

utilizes our touch power control' 

VRL3KMX Kit /Plans $119,50 



See In The Dark Viewing 

Device uses invisible mirared 
illumination for seeing in total 
darkness Excellent 
for low cost night 
viSion,along wrth cPserving 
lasers and other IR sources, 
Fundronai umi, many useful applcations 

SOS Plans . , . . 

SD5K Kit I Tube ,' Plans 

GPV10 Ready lo Use Viewer 

5032A Tube Plans to build your o«im 




$10.00 
$299.50 
$499.50 

$99.50 



(D 



Order by Mail, 
or by 24 Hour 
Orders-Only Phone: 

800-221-1705 



ifMTBO TtME SPECtALS! ORDER TQDAYf 
*j^ ItomB ttaflipcti vtiXh Ihis i&i\\ srt comffa\jti\c 

'V^m wiUl X-10 pawfiEtiouu<. Lcvilon Dccdm Eili^c- 
ironlc Controls. RodJo Shack Plug nPov«r, Scars 

mt} Control. Stanley Lightmaker. QE HarncnumJof , 

1^ masr powerlfiw csmc'r nimote control svfitcm&. 



-ree Home Automation Mug] 

Gel Ite ecixits^'e gtfl vfll^ ycwr on»f a( S 1 49 or mc^ 
Greed fcr ilinking fresh^ brsMsd ooflte from your I 
nriodi&-ccn(n3lod cKftae maKsr. Ofder HCC-71 1M J 



HOME CONTROL CONCEPTS 



^Free Home Automation T-Shirt 

GeJ thia greal gitl wjlii every orcJer St99 or 

rnor$! LFmit«d edition, available In S, M. U XL. 

L OrttBf number HCC-711S. 



Brand New! One-For-All 12 

Lete You Contrt^ XW and Infrared from one remots! 



Untvorsal Electronics has |usl unl«a^ii«<l Iheir 
r>9w«$t mochjl remote Control, Ihfi Ono-For'AII 
\2. Bilted as the mosL powerful universal remote 
In the wortd. the Ono-For-All 12 replaces 12 of 
your existing remotes lor TVs, V€Rs, Cable 
Boxes. CDs, AudUo Products, SatelllEe Recervers 
andmonjl Itcan even oontrtil XIOmoduleaE 

The One-For-AJI 12 has a 32K tnemory which 
contafhs the world's largest library of Infrared 
codes! In facl, the nrtsnufaclurer is so confident 
that your component's infrared codes are 
panUiIr>e<l in the One-For-AjJ 1£$ memory ih^v 
they're offering a DOU BLE YOUR MON E¥ SACK 
GUAFtANTEE! \<M HOC Customer Seivk^ or 
Universal EiectronJcs tof luithAf details} 

Check out Itiese greal features: 
Provides any device wllh a Sleep j 
Timer function ' Simple set-up ' 
One Button System Control " Per- 
fect replacement for tost or bro- 
ken remotes " To^^Frea Con- 
surnsf Help Lin«* Upgradable ' 
(bymanufactumr.nochargsl) ^ 
to matdh Ihe latest advance- 
ments in IR F^FTTOte control ■^ 
technology... won*t be- 
con>e obsoletel 



audioorvideo syslemscanbepiovirered Ujp witJi Ihe 
touch of a single key! Saves bme & cxxweniiencei 

XI Compatible] Combine v^ih the KCO-3000 
One-For-AH Command Center (or control of your 

hK>me entertainment devtoas AND X10 devicas! 

Just aim the remote at the HCC-SOOO for instant 

control of your 

home's lights and ^ ^■^'tjs 

appliances! ^ S^'f^^ 



v-.xnmjfJ Cciiirr Ijltip Wodulr 



Attention PC hackaral The OnfrFor-All 12 is 

'^aven PC compatible with the additton of 
" . the HCO-PCm PC 10 tnfmred fnterf^cef 
{see descriptton lower nght) 

,On&-For-A{f J2 Univsrsai 
■^mvSo Controi F£CC-RC5 
ONLY 579.95/ 



Sulll-ln macros mean you can turn on a number of 
IR devices wilh the touch of orve butlon! Compter 



On&- For-Af! fnfraiTfd Ckxrvuand 
Center HCG-3O0O ONLY $29.95/ 



New! Supervised Wireless Security System 



In^tnlts in minules - walh no tools - and no wiring! 
URCiBOOO Console keeps irack of 1 6 zones and 
displays sEstus of each using LEDs. Because 
It's supervl&ed you'll know if any doorAvindow 
sensor Ig not working or has low baltery. Add 
wireless doorAvindow sensors to protect up to 
1 9 different groups of doors and/or windows- 
Add a motion delector to protect an 
area with more than one entry point, 
Gon&oEe sounds k>ud 85 dB 
alami andsendsX-1 Osiignals 
toflash all X-tO lights! Scares 
intruder and makes homo 
vis;lble (o olherg (neighbors, 
police enroute, etc), 
BONUS* Free HCC-6T4t Wbw youo tder gn 

Ump Module sVc^jU^f^ 

I ^^fl/jjieyplug-m lamp module controls ^jjl^ ^jn 
I fncarKte«cent lights up to 300 Walt t"^ 
[ max, OfT-whltecolor. Only 650 modules 

reserved for thi Is promo^p^iL n \y <CnC 
Lumltie HCC2474 ONLY *0^ 



Built-in Infra red command center^see ■ [f^Am 
HCC^aOOO, above) for use with One- "^x- 
FoT'Ad remoEel Console is also a i 
receiver for Ihe Stanley hand-held 
Mobile Control and Ihe X-10 hand- 
held remote for controlling 16 X-IOdevicas! 

Expand your system anytime by adding door/ 
window sensors, motion detectors, or a plug-in 
Poweitiom siren! o*if '*^ 

HCC-aooo Security Consde ONLY ^69! "'^'J 
HCC'S74(<eychainamvyisamnONLY»21» * 
HCC-534 DoorMlndow Sensor ONLY M4» 
HCC'SOe PowBrhom 110 OB Sinw ONLY ^3*» 
HCC-S54 Wireless Motion Oeleclor ONLY M&m 

fiCC-9000 and One^f^or-Aii ntnote control 



^Stanley Home Control ^^■^ 

Turns on/off up to eight XI Itghts" 
I and app^arioas. Has llEumn-Lated 
I ALL LIGHTS ON button. Also has , 

□1W8RIGHTEN arid AiL UNITS OFT 
I buttons. Qff-wt^e color. 
LLimil 16. HCC-2551, 



ONLY^S^ 



^Heath Zenltii Motion Switch 

I SertsesmoEKjnA turns on lighl. AdjusSable delay I 
shut off. Grcs^fQfhaliways. basements, garages, 
laundry rooms, baltirooms. more. Photocell ad- | 
jusls for night-orly ^M| V S^ yl 95 

Lopai-atioo Hcc-8t05 VJInLT 1*+^. 



^t^^Ji lUlobile Control & Base 

I hdl<l remoto dona in slaak ^ 
I 1980'satylina. Transmils BF ^\^- -^^ 
I signal up to 100 fl. to plug-i 
I t>aso transcflivBr. OH-wfiile '^ 
color. HCC-2563. ONLY ®37^ 
>2S54 AtWBonal Mobile Contr ol 0NLY'16«j 

HuSotlon Detector & Floodsl 

..^'pi. Detects motion. 

turns on floodtghls, 

J W^'j^^'^^'^A ' ^ nT^*A J ^"^ sends up so four 

ls^\%i; ^nlG X-tD ON stgnaLs lo 

' S modules located tnskle or outskJe JJia 

house, OFFdelay (10sec.lo3SmJn.).diiJsk/ 

dawn and sensrtivily adjustments. Detects 40 

tt.atUCPajc. Wealherproof. Bulbsnotind. By 



Buy with confidence from HC 

• LOWEST PRICES GUARANTEED! 

■ DOUBLE MANUFACTURERS WARRANT 

■ TECHNICAL SUPPORT SECONDTONONi 

• IMMEDIATE SHIPPING 



^v'i^cWall Switch Module 1'=^ 

^Rapiacos existing wall switch. 

I ControEs incandescent lights up to 500 
Watt rnajt- ivory color button. Only 
830 moduk» feseived for this pn:KHo, 
$0 order nowl By Stanleyj^xik 11 x fitfsoti 
Umit 16 HCC 2475 ONLY*9^ 

^jCC-g4 76 3-Way Switch Sal (pair) ONLY'i^ 

fNew Edition! Automation Bookl 

"How lo Automaie Your Hcgne" by David Gaddis. 
E>:cflllef>t! Review? In Popular Science & Radkj 
Electronks, CircuFt Celkar INK. & Electronic 
House. This superb book is rww in ft's 2nd 
edilion, expanded and tmpn:]ved! 150 pages 
and over 125 illuetrati'C>nsy~\ii 11 \/SOC96l 
L Reoomnnended Re^ *23 ^Z\Ji N L T cKy^i 



^Stan/ey Premier! 
Home Control [ 

^jv^J*^»^^^^^Same faaiqres as Home 
J%^jff^*^^" Control (below); corn rols 
C "C^^-^" 16 devices. Handsome simu- 

^lated woodgrain design with amnked 

[X-10 Development Kit55:^f 

Use lo devekjp your own PC-l3asod "smarf"'* I 
home automation system 1 Monitor $tatus of 
home's I ights S appliances and ma ke Intel ligent 
dacisJonsbasedcntheirorii'Dffstalus. Develop 
a home control system with IF-THEN k>9hc, 
even l -button macros! Add Stanley motion | 
detectors to give syslem inptit of room presence 
Development software tsintarru'pttjased {does I 
not u$e polling!) ar^l includes compiled library | 
routines and sample C-language source code. 

Use wilti PC W Infmred (ntsfface to develop a I 
system whteh combines home automation and 
IR control: any X-\0 conlmller can control 
Infrared! With additbn o^ Voice Master Ksy, 
votee control of the home becomes possible^ 
Use X'lO's5y/KtokmflrtogfvedLisk/dawn Input 
to your system. Add voice PC vok^e mall card | 
for remote call-in control of X-101 

Requires IBM Of Dompatibia compuier with pami- | 

lei port, [ncludesTW523 module, adapter, imer 

I face catite, devetapment software, demo pio- | 

a_ram 1 technical Infa^tata. HCC-523K QNLYVS&ii 

PC to Infrared Interface 

I Great for development of your own infrared 
home control system! AltowsyourPCfolpusli 
buttons^ on remote control! Combine PC based 
home automanon wJJh inlrared control of your 
TV (volume, channel, etc), stereo, VCR, and 
rrwre! Add whole-house IR repeater such as 
X-tQ'sPoiwemtJitf. UsawithCovok Voic^iU^er 
Key for vok;e control of your entertainment 
system! Combine wtthX- TO Oa^^/opmwifK^r 
to allow any X-iO controller lo controt your 
Infrared devices! Use with votee mail system 
(or remote control of IR from any telep>hone. 
Possibrlilies are iimitlessi 

Remote control lEnksto PCs senal port. Uselhe 
SendIR pfogiwn to trartsmit mfrared signals 
(eg. Ttie dos commarKi SencKR TV P4UTE will 
mutelttetvj). Call SendlRfrom DOS batch files. 
your existing $oftw3re prOgrBm, of devekjp a 
program fiom scratch usingsample sourcecode. 
Complete with interface, cable, devekipment 
soflwa/e, sample C-language source code, 
technical info/data and documentation. 
Requires Ons-Fot-Att or r-Confn?^ remote 
conErol and IBM or compatible computer whh 
I serial port. HCC-PCiR 0NLYW9/ 



Keychain control of anythingr 

Manufactured by Linear, mis low cost RF link is 
ideal for wireless control o( your own projects, 
I your home ar>d car alami, car doorkxits, arid 
I evenX-l0rT»odules(wi1hftdditkxiofHCC-2a4X' 
10 Powertlash Module)! Set security code 00 
transrnittef and receiver, appty power tb c^ceiver 
board, and you're ready for whraless oontroll 

TRANSMITTER: Tiny keychain 
transmltier is approx. half the 
\ height of a matchboxl 
'^>" Transmitter has two buttons 
I corresporKtHngtochenrteEs t arKl2. Indixtestwo 
Lrttiium bafteries, Up to 1 1X'' range. 

RECEIVER: Board level 

receiver measures 
I approx 3' square! 

Requires power suppfy of a" 

to 24 VDC or 1 2 to 18 VAC. Two^ 
I outpuis (channels 1 and 2) can ea^iiswftch up to 

300 mA Q 18 VEX!: nnaxHTiLtfiTtogfouod. Directly 
I activaEe rela^, drive bulbs, more. 

HCC-RF1 RF Link set includes transmitter, 

receiver documentation, ONLYS39"f 
HCCRFX Extra EransmltEer ONLY *19«/ 




>2S4 PowerflasJi Modulo lot XtOmntrol %\ 



^ 



^ HACKER'S BONUS: G« a FREE Siitra trans- 
rrlflwwilti HCC-RF1 and total HCC purchase 
, ovor S249; Oiilot number HGC-71 1 R. 

Tl}ecora Electronic Controh 

I Pn3l«sicnalc)ualty, X-10c[]mpalt4eswAchee,ra 
I oeplade3,con(n:ls(s,llsn,ai7isJbrkJgBsandteE 
I equipment by Levkn. hnprousd naw iJssiQn en 
I slylingiswitdieskxjk IDENTICAL toDecorawHi 
I mckar swrtehas, LED irriicaJes ON/OFF status 
In white, rvory and bfcwm. PRICED BELOV 
I TRADE (contractoribulUertolectrfcian prtangjl 
"»^ 6291 Wilt SwMfih Use to COTtn 
ftuorascenl llgtiting, appliances 
mntors, eic. Ratad ISA. 
esai-U Celling Fan / Low Volt^ 
Dimming Switch Mwjule Dimslo 
' voltage ligfiting and conirols mcfl 
speed (e.g. oeing fans) using X 1 DIMfBRlG N 
I 500W ingonctescsrt. 500VA Inducliwe. „*'"' 




CaSI or wnto for !ioa iovitan !is!\r>g. 



J 



f^^X. ^'^^'^^9 Appliance Modul 

' ^ PEugHn appliance module rased ISAresisii' 
500 W lamps. 1/3HP motors. Oft-wtirto. 5 
unils reserved for promo.x^it ii v/ ^rv 
^^BySEanley HCC-2550 L-'NLY ^ 

Enerlogic ES1400e 
I step up to tntBitigent Home Contr 

I New ESt400s puts ouE 50% strongef XtO sig 
I St length than or>g<rtal ESl400f Ver3kxi2sonw 
I & exparsion port for futuie integrated pfoduc 

I This Intelligent XI scheduler wilh 2'V 
I interface monitors your powedine and alk 
I IF-THEN conirot. Combine with Stanley mff 
I detectors and have musk; and mood llgh 
I lollow you from room to room I Use J 
I Sundowner to give your system dusWd^ 
I Inpul Great lor setting up one-buEton mac 
I Once you've set up your home program, the 
I ttne simulaior allows you to test it oomplei 
I Once Ihe ESi400e is $ei up, your PC ma; 
I powered down or used for ot^e^ pLFrp<;ffies 

I The ES1'40C is packed wrth features, inclu- 
I a battery t>ack-up, Hayes Chronograph c 

Land calendar functions, programming sami 
I on-line help, compleie documentation, -^ 

ter ONLY^359°^ 



INFO, PRICING & CUSTOMER SERVICE 

1-619-693-8887 

TOLL-FREE ORDER LINE (ORDERS ONLY) 

H1-800-CONTROL 



WHOLESALE PRICES. MOO MIN. PER ORDE 

It Hr.'>i Vij:.i(n-sioc^k>[*!ia&nipwi!tm24fKKjrB fax atJplicsi lo CaliJ otdcrs lo' noo-rraate Sm. 
Hjnoimg cJmiga win be ockled to cftka COD orders odd Sio30 id siv^^payi chj&oa. Our sEfflvSard i-- 
memod vt me Continental U.S istTyUPS^oundsvivka AdcfcliOnalctwgclorUPSsoOCnddayair.UT 
Day Air. Federal Enptcss or Airboma ixpresa. Alaska arid E-lavrail orders am shif^jod by mr •■ 
tr^lqmoEional ixdar^ mual be paid In LES lunds by money order, csshwrv chcclt o* creoii card f^' 
rrordxardisa subja^ lo 15S ioslod(ing fee. EM^oru /eturning call lor lequired RMA nurritx^r 
morchiuidise (tost equifxnent, eollware, btxAa. etc) nay noE be ret4OT)edlor crecW Ocfectrvo proocu: 
t^jalied or replaced at our option Dokible manuUiclur«'s warrant Of^ntosi^ems' Wewtlimaichort: 
conipclilor^prtco,' NoErespcx^fbtefiM|ypographlcslmOf5. LtiiAiidltme^MJcioIs. OiHUttitwsmaybr' 
^hone ouf Customet Sciwx Oepartmwit tjotwctn 8 am, and 5pm P.irfic Trme lot complrt*? dc-; 



CIRCLE 265 ON FREE INFORMATION CARD 



VACUUM TUBE DEALER PRICE LIST Apr. '92 

SOVTEK®, RUSSIA 

$5.25 each 12 at $4.75 each 25 at $4,25 each 

4.35 3.75 . 3.60 

6.75 5.90 5.20 

2.90 2.60 . 2.2S 

S.80 5.20 4.50 

4.2S 3.50 3.20 

3.50 2.95 2.60 

6.75 6.20 5.75 

The 5881 is Russia's selected military 6L6WGC and is regarded as the very best 6L6 type in the world. Eric Clapton recently 
replaced the Phtlips/Sylvania 6L6 STR's in the custom Soldano amp which he uses live, with SOVTEK® 588 1's because of their 
milky smooth sound. Discriminating musicians thruout the world are retubing with the SOVTEK® 5881/6L6WGC. 



5U4G 

12AX7W A/7025. 

6922 (military 6DJ8) 

EL84/6BQ5 

EL84M/6BQ5WA 

6V6GT 

6L6GC 

5881/6L6WGC 




50 CALL FOR SPOT QUOTE 
100 CALL FOR SPOT QUOTE 



5U4G 

EL34 

6L6GC 

12AX7a 

12AT7 

6146B 

6550 

KT88 

EL34/6CA7 

KT90 

6DJ8 

12AU7/ECC82 

12AX7/ECC83 

EL34 
12AT7/ECC81 



EL34 

EL34BL (COBALT BLUE) 

E83CC/12AX7a 



$4.90 each 

5.25 

4.75 

3.85 

3.90 
11.50 

9.85... 
13.50 . 

$5.10 each 
23.90 

3.15 

3.15 

2.70 

$7.25 each 
4.50 . 

$7.25 each 
7.95 
5.90 



SING, CHINA 

10 at $4.25 each 

4.80 

4.20 

3,25 

3.55 
10.60 

9.25 
12,50 

El, YUGOSLAVIA 

10 at $4.65 each 

21.50 

2.75 

2.75 

2.40 



25 at $3,95 each 

4.25 

. 3.80 

3.10 

3.40 

. 9,80 

8,95 

11.50 

25 at $4.10 each 

19,90 

2.35 

2.35 

. 2.15 



1 00 CALL FOR SPOT QUOTE 



100 CALL FOR SPOT QUOTE 



H H M 



SIEMENS, GERMANY 

10 at $6,75each 25 at $6,20 each 

3,90 3,75 

TESLA, CZECHOSLOVAKIA 

1 at $5,75 each 25 at $6.20 each 

7,45 6.90 

5,35 4.95 



100 CALL FOR SPOT QUOTE 



1 00 CALL FOR SPOT QUOTE 



5U4GB 

6CA7/EL34 

6L6GC 

6LF6 

12BH7a 

12AT7 



$12,50 each 
15.75 
14.95 
19.25 

9.95 ^ 

6.85 . 



10 at $11.60 each 
14.25 
13.50 
17.50 

8.75 

6.30 



GE, USA 



6550a 

7025 

7027a 

7591a 

7868 

8417 



$19.95 each 
13.50 . 
17.25. .- 
15.50 
17.00 . 
15.85 



10 at $18.25 each 
11.75 
16.50 
13.75 
16.40 
14.75 



SOLID STATE RECTIFIER 
Built into tube socket. Direct plug-in replacement for all 5Y3, 5U4 and 5AR4 types. 

ODD BALL TUBES {MOSTLY USA STOCK) 



$6.25 each 10 at $5.90 



I 



I' 



I 

LU 

60A20 



4CX350A $69.00 each 6AX5 $4.90 each 6J5 $4.50 each 

6BA6 1.95 6J7 S.50 

6BK11 6.90 6K11 6.90 

6C4 3.50 6SC7 6.90 

6C10 6.90 6SG7 3.50 

6CA4 3.90 6SJ7 4.50 

6CG7 6.90 6SK7 2.90 

6EU7 11.80 6SL7 3.95 

6FHB 12.50 6SN7 3.95 

6GW8 6.90 6U10 4.90 



5AR4 


7.95 


SV4GT 


4.20 


5Y3GT 


3.95 


6AL5 


2.40 


6AN8 


5.50 


6AQ5A 


4.60 


6AQ8 


5.85 


6AS7 


4.50 


6AU6 


2.25 



6X4 

6X5 

6X8 

12AY7 

12AZ7. 

12DW7 

12FQ8 

5749 



$3.90 each 

3.90 

2.90 

5.95 

4.50 
14.90 

8.00 

2.90 



6189W $4,15 each 
(12AU7W industrial) 
6267/EF86 3.20 



(6BA6W industrial) 
5879 8.50 



6973, 

7199. 

7247. 

OA2 

OA3 . 

0B2 

OC3 



14.90 
17.80 
14.90 
3.75 
2,25 
2.25 
3.75 



GIVE US A CALL ON ANY TOUGH-TO-GET TUBES. WE'LL FIND THEM FOR YOU! 

MA TCHSNG A VAtLABL E ON ALL OCTAL POWER TUBES 65e extra per tube. 

"PLATINUM" MATCHING ALSO A VAILABLE WITH 24 HOUR 

TEST AND BURN-IN, ENSURING PREMIUM MATCH. PAIRS OR QUADS $2.00 extra per tube. 

MINIMUM ORDER $50.00 

ADD $5.00 SHIPPING ($10.00 OUTSIDE UNITED STATES) 

SEND CHECK OR MONEY ORDER TO: 

NEW SENSOR CORPORATION 



CONTACT: MIKE MATTHEWS 



133 FIFTH AVENUE, NEW YORK, NY 10003 
TELEPHONE: (212) 529-0466 TOLL FREE: 1-800-633-5477 FAX; (212) 529-0486 

CIRCLE ass ON FREE INFORMATION CARD 




1^-?^ 



IBM PC/AT CASE 

FuH Size AT Case i 

Accepts Minf or 

Full Size MothgrtiogrOs 

Slrde^tf Top 

fi Bkil FmmA. M&tia In U.S.A. 

Part No. 22C^27SdF 




AT 200 WATT SUPPLY 



Factofy Raburblshed 
FtB Ml 5«e AT case 
only,12<V220V Input, 



Part No. SOCMHMI 



m 



-^«39 



3 1/2" FLOPPY DISK DRIVE 

Maisushiti JLJ-2E3 

lndude6lwo3.5' 

Fata Platss (Gray & Beifl*).. 

Comes wtEh separata 

SVi- Mounting Kil 

Pmt No. 220*11 ep 



UISIV UHIVC 



5 1/4" 1.2MB FLOPPY 
DISK DRIVE 

High Density 
HhactlHHFD5teC12U 
Mfg. fof IBM>eiX4E1S 
Stack Face Plate only! 
Psrt No. 220-342 tF 








MS-DOS VER 3.30.01/GWBASIC 

OEM VERSION 3.30,01 Has an. 
Expanded Memcrv Manager tor 
above 540K on S038S computers. 
Print Spooler, Cache. & a Ijte 
Encyptifxi Program, 
InelutJea S 1/4" & 3 i/T disks. 
and f^anuals. 
Part No. 229-3»aSF 

IBM PC/AT GUIDE TO 
OPERATIONS 

An KJ4al gfiitlrig started gyKto 

■for beginners. CofTipleild wUh 

Exploring Ttie IBM Personal 

Computer Software. Ledrn the basics: 
keyboard commands, printer functioris, 
disk storage, dos, basK; progrannming and 
Funwrtter a basse word processing package. 

Includes IBM AT Diagnostics Otsk. 

(iBM#6a&Dioa) Rfltaii~^'|>i*w^*r^ $Q 95 

Part No. 220-007aF -^^HSUT^ — %7 ■ £ 

IBM PS/2 CARRY CASE.^_^^^ 

Genuine JBM Produci 
Deslsned for PS^ Wodel 25 
Also worlds great with MACintosh +, SE 
Hflmovable casters Si feet. Heavy duty 
padded Nykx^ conslructk>n. 
Ccimpletely unzips tor easy stonige 
StzelS'x M'x T6* 
Part No. 22a-e422F 





SUPER 8 REPEATER 
PROJECTOR 

USED Po/iabl# Projector. 
Indudes a Supar B 
Continuous Play Cossfilte, 
emm him can replaced 

wiSh youf own Super S films. 
Has foW ouM 1 '^A^ X 6-3^4" 
Glass Screen, Bulb ir^ludsd. 
Includes Packjed^ Hard Sk:ied 
Carry Case 16-1/2' x 14' x 8" 

partNo. fiso^nap 






ALARM BOARD 

Greal exponmenting Poard. 24 itig ancJ 
6 iLig tentiinal stnps, S relays, 8 slcda 
swrtciios, over 30 iCs, 4 heatsinks. 2h 
four conductor telephone line cord and 
many other parts. 
Part No. 100-9990F 



$0 95 



PLASTIC PARTS BOX 



15'xU'!(5* f- 

Gieal fof urKter ' 
counter storage 

Part No. 590-999eF 




SCHOOL BUS 
ALERT 

Home Receiver to alert 
Sludants as 10 the locBlion ot 
their Bus. Recetvas Signal 
frorn Bus equl[3ped with 
SIMON TRANSMITTER(tjekJW). 
Mtfl. TRAMS ALERT 2000, INC 

Part N«. «60-94a3F 



Add up to 
250 units 




mSili^m 



*9, 



95 



SCHOOL BUS ALERT 
TRANSMITTER 

Bus mounsea Ponable 

Transmmar [hat a/irwurices 

rts local Ion lo the home unit. 

SIMON TRANSMITTER 

Mfg. TRANS ALERT 2000 

Ideal for siudanis wlfh special needs 

Part No. 660-3404 F 




INFRARED REMOTE 
A/C SWITCH 

Lets you turn on/ofi lamps, 
Appliances or other I^V 
devices using an IR 
transmrttar Turns units 
on/off from up to 25' avi^ay. 
2 prong non-polanzed ISA, 
Requires a 9V battary. 

Part No. 660-0021 F 




Order Line 

1 -800-344-4465 



Mendelson Electronics Co., Inc. 

340 E. First Street Dayton, Ohio 45402 
800/422-3525 • FAX 513/461-3391 • 513/461-3525 



CIRCLE aS1 ON FREE INFORMATION CARD 



ROOF MOUNT UHF 
MOBILE ANTENNA. 

UHF 445-470MHI 
5dB Gain 

Complete wrth 14 ft. 
<A cable and PL-259 

Part No. 1 10-O027F(3/4" Hole^ 
Part No. 11O-0028F(3/S- Hole) 



1^15. 



95 



h/IAGIC FLASH 

Flecironic l]a»h.- 
Ju£t add a swtlch 
and three vote. 
Requires 4 'AA' batteries. 

Part No. fi60-D025F 



Q 



*3. 



50 



FIELD SERVICE KIT 



The Legge Reld San/ice 
Kit permrts repair tecn^cians 
to partorm field repair on a 
Etaticfree eurtace. Cofnplete 
wiitn 2' X 2' work surface, 
wnst'ban.di 15' groundVvrth 
1-meg ohm resistor and clip. 

Part No, 570-000 IF 




«19. 



95 






STEPPER MOTOR 
KIT W/MOTOR 

Prfl-prtmed Gtrcull Board 

wl]h all the pans lo 

assemble a oomrollar that 

allows you to change directions. 

vary Ihe speed, or single step the 

(hcluded Stepper Motor- Has LED's 

Itiat flash when moiof steps. Raquires an external 12VDC 

power source. ^Not Included) *j >* nc 

PartNo. 6S0-0160F IW. 63 

ERECTOR SET HARDWARE KIT 

10-1'4' X 6* X 2-1M' Plastic Box 
includes 1500 B/3Z NuB, 
1500 no Washers, 40Q' 
e/32 X 2ii' Slotted Screws, 
600 &r32 X 1 12' Slotted Screws, 
* 600 a32 X tW Slotted Screws 
FREE SCREWDRIVER wrth each KIT 



$30.00 Value. 



Part No. 330-0055F 



^14. 



95 



ANGLED PROJECTION LENS 



7-3/4' X 5-7/8'" X 6' 
Right Angled Len$, 
designed for use Jn 
Rear Pj'ojectlon TV's, 

tOSmm Foral Ler>gtti, 

Black Plastic Housing 

w/Gtass elements. Lever Focusing. - ^ 

Mtg, by US. Precision Lens Delia 7T-0C $Q 95 

Part No. &40-0OO7F w ■ 



IP 



TI-99 KEYBOARD 



Mfg B/ STACKPOLE 
Mfg. P^ 1039019-1. 
48 Keys 



Part No. 3S0-29r4F 




Great 
Buy 



99' 



ea. 



5.6" CABLE TIES (RED) 

MIg Panduil 
P/N: PLT1 SI-MZ 
Meets Mll.-S-23t90 
Dla. 1 3/8' 



Part No. 320-01 99F 



«15. 



00 



(perl 000) 



tan PCTiT tf. i. iigatarHf WnMnwrt. a fli* Cvp 

FERUS MASITFICAfOVKiLnSCOVEn, OIECK. di HCMCV DflDEfl 

,'l:;^Kk« <^* rn4 ■*«««* i« ^^vant ] 

Siipo'^ii'tvri>i^tf-*fi^antnPM»''atiatvnavr».Mai^aatoiatt*^€aOi 

P!>k?i« iM^pcl 4 Etvna* •■«<M "An 

$20*00 Minimum Order 

RMjnMtHlOd^itWBIKlkiJ »^ tVtfpOngiH LU r^kjUM nitf ^n IIUiJ,i 

Call or write for a free catalog. I 






o 

3 



60A21 




Satellite Television 



FACC 1 992 nUVCnS GUIDC 

ufilh fteciever Comporison Chorts 
Fft€€ H€IUSL€n€ft ON SRTCLUTC INDUSTRV 

FftCC INSrniUITION KIT lUrTH CVCnV SVSTCM 

On ■ Ifoaner Baste <SIOO depoMt reipiiredy 



Complete System $1199 



EchoStar 5000 




20 Favorite ChanneEs 
VNR Filter 

90 Satellite Memory 
Full On-Screen Display 
Auto - Peaking 
VIdeoctpher 1 Plus 



It' ir r.y Muh litm 
Ediilif Hit ir 

lifhi MOO 

4DI tr litrir III 

Mild FiiJ liri 

tl" ilt(k Ink 

frii littillillii iiiitr III 

Adi^ .75 ptr Jt.for cabit iw 23' tn^rfmenfi 

SS5.00 for Frttf^f im 48 Siaui 

SlOO Dtpotit 0M IrntaUatiom Learner Kii 

CFlk» nbiMJtKtkiii) 



Call for a Direct Quote on: 

Chaparral Monterey 
General Instruments 
i Hf S (Houston Tracker) 
Toshiba 
Uniden 

"^per Low Temp INBs 
Ku Bond Upgrades 



10 Ttkl CJUSRATIOM 



TRAOE-IIV UPGRADE PRftGRAHl 

GREAT DEALS OIV PREVIOUSLY 

D%¥IW:D EQUIPlflElVr 



Ttie DBS Advantage 

Order with Mortey Back Low Price Inter national Volume Pricing Commercid 
Confidence Guarantee Guarantee Solas Sales 




J»--^ 







□ I am a Satellite System Owner 

o| am planning a purchase of a Soteliite System 

ai am planning an upgrade to my existing System 



O Please send me a 1992 Satellite Buyers Guide 

\ Name • • • 

Address • • 

City, State, Zip - 

Telephone 

Mail to: DBS Satellite. 2316 Channei Dr.. Ventura, Ca. 93003 



Please add my friends' name to the mail list; 

Nome ■ ■ ■ 

Address 

City, State, Zip 

telephone 



» 



aRCLE 299 ON FREE INFORIMATION CARD 




Satellite TV 



Catalog/Buyers Guide 

(Ask for *Dom0stic(56 page) or lnt6niational(16 page) vsrsion) 



> Complete Systems 

> Upgrades 

2ft to 24ft Dishss 



■ Parts 

• Accessories 

• Major Brands 



• Factory Fresh 

• USA Warranty 

• Fast Delivery 




'-:^ist- 



WORLD 
SATELUTE TV 

AND 

SCRAMBUNG 

METHODS 



The Technicians' Handbook" 
JHs thorough text !s a must-buy for tadriaani, 
aatallits professionals and curious do-it- 
yourself efs. 

Ths design, operation and repair of satellits anten- 
nas, feeds. LNBs, receivers and nrtoduiators are 
eKamfnad in detail. An in-d«pth study of scrambling 
mathodE and broadcast formats including Una 
VideoCiplier II, OaV Orion, RImNat, Sky Channal, 
EuroCypher, 02 MAC. BSB and Teledub Payviaw 
ill. Circuit and block diaoranis of all components 
are presented arxj daarly examined tf^roughout the 
handbook. This Information Is a prelude to the 
chapters on troubtesfKioting and setdng up a test 
bench. This expert guidance on testing, servicing 
artd tuning is oonpilmented by a vwsalth of detailed 
ilustmtians. 

W ptgiii SMZxM)Stt ovtrJOO pMsi, dl(gr«m*, 
wiring ichtmitics ind 16 tibtiB / ipptndlcn / IndiK 
S&H $5 (U.S.) $39.95 

THE SKYVISION 

DO-IT-YOURSELF 
INSTALLATION VIDEO 

'Now You Can Watch It Being Done" 

Installing or Tuning up' your sateilita system 
made simple. 
VHS or Beta....S&H $3 (U.S) $33.95 



ORBITRON 
Mesh Dishes 





Bulz-I-Tuning Meter 
Now with 
audio alert 



Pico dish 
Tuning 
Mstor 





'Quality Demonstrated 
by Performance" 



$235 
235 
345 
435 
625 



TUNE YOUR DISH 

TO ITS' 

MAXIMUM! 

A must for tha serious dealer or tatelllte 
system owner. Saves time, frustration and rroney. 
Use when installing a nmv system, moving your 
dish, re-alignment of a dish thiat has been imvsd 
by wrind, frost heaves ale., gats you right on iha 
satellite belt for the bast possible pictures! 

Pico meter S&hl $6 Catalog prk:a $89.95 

Sele Price S7B.96 

Buiz-i-IV meter S&H 16 Catalog Price $149.95 
Sale PrtM $139,69 




NEW "Top OF The Line" 

Introducing me Drake 1524 fRD 
(Integrated receiver decoder) 

Tha new Drake 1 524 is at present the ultlmaia 
in anginearlng achievement for IRDs. Picture 
quality Is nothing less than fantastic. Most of the 
time as we review new product models, we find 
soma new and exciting bells and whistles. Tbey 
coma with tha Drake 1524 also, but this modal 
goes beyond the usual. It has tha btestdang 
picture quality that weVe ever seen. 

Hooked up to a new 60" Hitadii rear prcjectkin 
TV you can see the diffarenee. With other top-of- 
tha-line IRDs we see a lot of magnification of 
video noise. Mot so witti tfta Oralte 1524.. .It gives 
us sparlde tree pictures on alt but tha wKltestof 
transponders. 

Use it with smaller satallita dishes and the 1524 
continues » shine. It's low fireshold (less than 
7dB C/N) provides performanca on a 7 toot dish 
that we used to see on a 10 footer. 

WeVe seen them all (all major brands] and 
have them in stocit Right now the Drake 1524 
leads tha pack and best of all irs made !n the 
U.S.A. If you're considering a new sj^tam or 
upgrading your present system... The top-of-lhe- 
line Drake 1524 JRD would be the Intelllgant 
choice. Your satisfaction is guaranteed! 




^^OOcBi 



»/ 



LNBs 



LOW TEMP 
"Hemt Technology" 
"Commercial Gride' 

45" LI^B C-band 4GHz S&H $6 $95 

40" LMB ■ " - 99 

30° LNB " " - 139 

25* Ll^B » « tt ^gg 

1.3dbLNBKu 12GHz S&H $6 $109 

1.2dbLNB ■ " - 119 

l.ldbLNB ■ » "129 

I.OdbLNB ■ - - 139 

O.QdbLNB ■ • ■ 199 

0.edbLNB ■ ' • «9 



dish & poiaf tracking nyxjnt 



m 



ACTUATORS 



16* Superjackll S&K $14 

24" SuperjackXL ball " 15 

24" VanMa acme " 15 

51" JGS acme * 22 



$89 
139 
129 
219 



All Ma]or CrMJIt 
Cards Acc«plad 



Slq/pision Inc! 




1046 Frontlttr Drive, Fergus Fails, MN 56537 - Toll Free 800-334-645S 

Mail in coupon or call Toil FREE KxJay for the SKYVISION Satellite TV Product Catalog. 

Delivered free to your mall box In U.S. and Its possassk>ns. 

* International requests add $8.iX) to cover shipping and handling. 



Q Send Skyvision Satellite TV Products Catalog 



Name. 



PhoneJ L 



State. 



Zip_ 



Install A System, Upgrade & Repair Yourself And Save $$$$ 



Call Toll Free 800-334-6455 International 1-218-739-5231 Fax 218-739-4879 



CIRCLE 270 ON FREE INFORMATION CARD 



! 

m 



z 



60A23 



"WE HAVE GREAT CONNECTIONS 



#TM-319 DOUBLE DISK*" ThruiglnilpntcnMcUik converter. 

HOW JS THIS POSSIBLE? Have j-ou ever Wed to fonnat • regulic, double 
density 3.5' disk to 1.44 MB? Of coune yoy have. It doesn't 
worlc The compulv givea you an invalid in«dl« error. So there 
must Iw t diff<T«fxz In the disk medU. Right? 
Surprtslngly, monufaeturen Bnd It lew expnwjvc to use 
THE SAME MAGNETIC MEDIA for both HD and 
DD disks. THE ONiY DIFFERENCE IS THE 
EXTRA SENSE HOLE IN THE HD CASE TTut 
hole leil« the dhve to opermte In high density mode. 
Soh how can yQU tal^e • 'vantage of the fact that the 
media is the same? 

TWO YEARS OF TESTING. We've conducted an in- 
tensive testing program- We have converted over 159,800 
disks and tested each one for data Integrity. In tvfo years 
NOT ONE CONVERTED DiSK HAS LOST ANY DATA! 
SUCCESS! "The Double Disk Converter" Is a true 
product au<c^e story. From the moment we put it on the 
marlcet the order Unea have been ringing non stopl 
Nearly every ampr corporation, schooL university and 
government agency is now using the device. In liact, over 
one hundred thousand satisfied purchasers are 
amverttng jnllllorei of disks and SAVING SERIOUS 
MONEY with the Double Disk Converteri". 




STILL rwf B£sr 
Ma^ ot heavy gauge, deep 
drawn slosti For alt IBWdoftas 
and Macintosh systemsl Don! 
trust ycHJTCto/a ivrfh anything 
lax man This Onalnal DoiMa 
Db* Convener"! 



$26.95 ead^ 4 up $25 each 



#VA-102 3-WAY COMPOSITE AUDIO/VIDEO SWITCH 



Audlo/VkJeo 
ContToi Center 

■Three Inputs 

* On« ou^ut 

■ AH with 3^«r» capability 

♦ Simp]jft« your A/ V book-up 

■ Standard RCA rypejackd 

• KCA Cdblcs Dviiibb]« 

Set-up your A/V aystem once 
and for all, Switches let you In- 
stantly Htect your choice of: 
VCRs, Video Dlic Pliyers. Cmtn- 
corde;s. Stereos, CD Players, etc 
ConiTolllng your A/V system 
has never been eaajcri 



STEREO MONUOF 




rSi 



VIDEODISC 



ura 



n.-n-]j"i.r^nnnn 



fi ' fni' 1 



^O^^i 




^TOeach 2up $8 each 



DATA TRANSFER SWITCHES 



m 



DATA TRANSFER SWITCH 



Typtcal FfonI Vi(»*y 



DB25 Seriol and Parallel 

A LI Metal Ca« 

Shielded with ^Id contacti on ^ connecton 

Gdd p]«ted contacts on til rotary switc^ies 

All pins hand wired 

y to 5Cr DE25 Cables available 

other conAgurationj available 



#DS''252 3 FymnlM Conncctoni 5lO 
#DS" 253 4 Females Conn i?ctor» '14 
#DS-2S4 5 Femalei CqnnectOrt $18 
#DS''2S5 6 Females Connectors $50 
#DS-256 7 Females Conn ectora $35 



#VA-154 COPYGUARD CORRECTOR 

Enfoy videotapes ^Jhouf noiNng and t&arhg 
Macrovision methods often make it impossible to enjoy a dear^ stable picture 
from pre/ecordcd video cos«ttes. Picture roll, jitter, snow, 
tearing and Hashing are the annoying side effects cui^ed by 
theCopyguard CqjtocIot. Sophisticated digital cit^cuttry 
Inside this compact unit (m^ larger than two 3mm tapes! ), 
unscrambles any copy-prot«tion scheme and delivers a ^ 
stqbk", whi^tle^dean signal, Connects easily between 
t wo VCK's, err your VC Rand a vi dco tnon i1 oi , wi tl 
ir^slnglL" video m ond vidft> out jacks, Reccnily, 
copy prolechon develop<rre hflvo aiicccssfully 
sucti to kocp un scramblers such as the | 

Copyguard Corrector off (he market. We CJ>nnot 
predict forhowjisng this unit ^1 be aval table. 
and iU£g«st you ordv early to be sa/e! 

Reg.S69.00 Now $49 each or 2/ $90 Spcdall 

Unaulhonznl dupticatien of C^yrl^tAi vJdeotapfA k pTohlblt«I hy Ffileral Cvpyrlslu 1; 




Agtomatic Electronic 
Print©f SwHch 



JOMML 



Use one printer 

with two coin puter^ 

Spedfy Serial or Parallel 

Safe for MP Lasef jet 

DB-aS CoCTifteetort I/O 

#DS-201 

$25 each 

4 up $23.50 each 



Dubbing Cable 

6 foot tnplie RCA gold stereo 

audio/video 75 ohm high 
shield CDKX cable. 



-co— ^ 



-For Dubbing^ VCR to VCR 
or to video ct.mpotienl, 

#VC-6VG 

S7set 3 sets $20 



^^ 



^ Data Transfer Cables 

u^ with L.Apllnk, Brookiyrt Bridge, etc 

#CC-210 

DB35 mak? For parallel use otlly 
6 (I $ 7 each 

DB2S femals *nd DB9 feiiniiles 

For icrlnl use only 

«(l $10 Kt 



DB15 femtlH. DBS (emilei, DB15 milaf 
For serial and parallel use 

6 ft $24 set 





Coaxial Afcenet Cabi< 

22 AWG Teflon Jacketed 

93 ohm Center Conductor 

QassI, 200 C 

II L Approved 

L.A.F.O, Approved 

#RG-62 
,lOe/ft over900'.09*/n 



lightweight Deluxe Ptantronlcs Telphone Headset 



Reduce telephone fatigue 

Har\ds-lroe cor^venieno? 

Work and lallt at the same tune 

Enpy the freedom uf a headset 

#TE-205 $25 5 lor $100 

with tone/pulse dialer 
#TI-204 m 3 [or $120 




Colled Power Extension 

6 U Beidcfi. Great for tnovable 
Ci'U'i / Monitors / Fritilcis 

#CC-PWXC 

$2 each 20 up S 1 .50 cadi 



Surg© Protector 

60utlet Povrar/Modcm 
EMI/RFI protector w/indicator- 

#TW-200 

$12 each 



P/S 2 Keyboard 
Adopter 




MlA] 6 pttl Mai 

to 5 pin Fetnale 

or t^verse 



=n 



#CA-200 

#CA-201 $3 each 



Credit Cards: Accepted 24 hours a dov 7 days a week by FAX. 
Company Check or Money Orders; You must Include S3.50 shipping and your telephone number. Cdiitornio residents odd 8.26% soles tox. 



v;w 



ffi] B 



ROGER'S SPECIALIST voice 800.366.0579 or 805.251.3085 



277 1 2 Pinehills Avenue , Soitta Clorita, C A 9 1 351 



FAX 800.366»0579 or 805»251-2520 



|\^ 



Terms Somrquantltm are Licnited. All itemf iub^ Ed pn-or sale. MmJmum ordifrSlO pliirt shipping. Shipping (ht aX\ orderi is $3^ UJ% surface (no PC? Box«), Customer specified shjppingat cam«r 
r*ie * a 55 handlinj^ Fee. Prepaid ofden irt »hlpp&d after the totnl amount due U n-ceived. If your prep*Sd onkr doe* hot Include shipping ^S350J and m1« tux (S.25^ CA residents orJy) your order will 
DOE bt proceiscd. Upon rKvipUJf you aitnotluitiiiflfHd^yiikj may rNjUfsti KStA And rrhim Emr lE^Tnai JmrnrdLiEfilv tout furcredli orvxchin^. Wtguarsntcvyourutis/itction-torryj due i& iha whd«Hlt 
luturt'Ofourb'uitnfU we Cflnnot of ft?r cish ri?furHl>. If youhavi any questions abouE youronder oi our produces, pLt'diwcdli Customer Service at 805 •251*3065 M-F,9 am toSpm, Pacifif Time. 



30A24 



CIHCLE 267 ON FHEE INFORMATION CARD 



jOMPLBIE FCC UCENSE PREPARifflON 

Genet^ Radiotelephone Operator's License * Second Class Radiotel^raph 
Radar Endorsement ■ - * All Amateur Radio licenses 



* MORE MONEY? 

*A BETTER POSITION? 
* EXCITING CAREER 
OPPORTUNITtES? 

AN FCC LICENSE 
MAYBE YOUR ANSWER 




Ttm FCC License Specialists 



We offer Home Study Courses for 
ALL TYPES of FCC Licenses. 
Formats include: 

TEXTS 

* AUDIO CASSETTE COURSES 
• VIDEO CASSETTE COURSES 
* REGIONAL SEMINARS 



GENERAL RADIOTELEPHONE 
OPERATOR LICENSE 

Your Job Opportuidty Ticket' 

'or years, the Commercial FCC license has been highly sought- 
fter by many technicians and required by numerous employers. 
The General Radiotelephone Operator License has come to be 
:nown as the most HIGHLY RESPECTED "ticket" in the field 
)felectronics.Formany,ithasbeenthe KEY to j ob ad van cement 
md higher pay. Many companies offer immediate pay raises by 
.imply passing the license exam. Other companies require the 
icense for employment. When an employer sees the FCC license 
)n a resume, he understands that the job applicant has a firm 
^■asp of radio communications... a firm foundation that can be 
juilt upon to meet the demands of any job situation. 

SECOND CLASS 
RADIOTELEGRAPH LICENSE 

BECOME A SHIP RADIO OFFICER: At present, there is a 
tremendousshortage of ship radio officers. This means lots of job 
and advancement possibilities. After a six-month training period, 
you may earn $45,000 to $55,000 for an eight-month year. If you 
are really sharp in electronics, you can take a test that qualifies you 
to become a RADIO ELECTRONICS OFHCER. If you need a 
review, some radio unions offer a short training program that can 
help you to pass that test. Radio Electronics Officers can earn as 
much as $60,000 to $70,000 for a six-month year. Does this sound 
good? All you need to get started, is the SECOND CLASS 
RADIOTELEGRAPH LICENSE. To assist you in reaching 
that goal, we have produced. The Radiotelegraph Package". 

WHAT OUR SATISFIED CUSTOMERS 
ARE SAYING 



"Your STUDY 
OUTSTANDING.. 
Lemon Grove, CA 



QUESTIONS WERE NOTHING SHORT OF 
Thank you for writing such a complete course." - EJ,, 



•I was so well prepared that lACRJALLY ENJOYED TAKING THE TESTS, 
while others I sawaround me were clearly floundering," -MA.E., Waldorf, MD 




I WPT Publications 

I 7015 NE 61st Ave. 

I Vancouver, WA 98661 

I (800) 800-7588 or (206) 750-9933 

I 

I Please ntsh me a Free Catalog. 

I 
I 




TM ^CC Lictfl i« Sp*ciaHn 



Name 



Address 



City 



I ! 



"Tlie day I took the test, EVERYONE WHO PASSED HAD YOUR MATE- | State 
RIALS." - J.D., Puerto Rico I 



Zip 



CIRCLE 2B0 OH Ff^EE INFORMATION CARD 



:Jl 

60A2! 



CRESTWOOD PRODUCTS 

40994 GIDBEL RD. HEMET CA, 92S44 

ORIGINATOR. MANUFACTURER & DISTRIBUTOR 

VU-7JIRU VCR DIAGNOSTIC TOOL 



UNITED STATES PATENT NO. 5.055,960 



A USEFUL AND WORTHWHILE TOOL for the 
• •PROFESSIONAL * 'STUDENT » *EXPERIMENTOR 



1-800-544-8583 

Fax 1-714-766-2779 
USA & CANADA ORDER TOLL FREE 



A PRBOSION MOLDED, IDGH [MPACT, CLEAR PLASTIC TOOL T! L\T REPLACES 
THEVIEaZGGVSSErTE WHILE DIAGNOSING THE PROBLEM. THE VCR OR 
CAMCORDER WnX PUNcnON IN ALL MODES ^ND THE MECi iANISM WILL BE 
OPEN POR INSPECnON, MEASUREMENT & ADJUSTMENT 



VHS - SVHS - VCR's & CAMCORDERS 






VT-103 



M^ 



BETA I II III & CAMCORDER 




BVT-IOO 



$9.95 



NOW A VU-THRU TOOL FOR 
ANY VCR OR CAMCORDER 



VHSC-SVHSC 
CAMCORDERS 




CVTIOO 



SM5 



SMM - VCR's 
CAMCORDERS 




EVTIOO 



S9-95 



AVAILABLE JULY 1. 1992 



msTRUcnoN 

MANUAL 



DETAILS FIVE 
WAYS TO USE 
THESE TOOLS 
PLUS OTHER 
HELPFUL HINTS 



ANY ONE TOOL 
$ 9.95 ea. 
S 3 JO S&H 
$ 13.45 total 



ANY TWO TOOLS 
$19.90 
WE PAY S&H 



ORDER ALL FOUR 
$ 29.85 
WE PAY S&H 




COD add $3.50 
CA. orders add 7% 
sale3tax 



aRCLE 183 ON FflEE INFORMATION CARD 



ACCORD FXEXTRONIC SYS IliMS 
Tcill Free: 800-998-2242 I-ax: (305)772-256K 



1001 NW 62nd Street, Suite 306-F 
Fort Lauderdale. FL 33309 



CALL FOR OUR FREE CATALOG 






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Smni Of Smm 
DiftuMd LEDs 

RED 70 

GREEN B« 

YELLOW 9^ 

20 pes min par item 

5mm RED BLINKER 

S0.6Qaa/5p<a S0.50/50pc5 

■^^3 7805 $0.35 

" "i 7812 50.35 

7824 $0.35 

7905 $0.45 

LM317T..... S0.45 
5pc» min per jtem 

/PN2222A 6<J 
PN2907A 6<; 
2N3904 6« 
2N3906 W 
2N4401 .64 

2N4403 6<J 

/HPSA13 8<J 
50 pes min 
No mixing 

2N2222A 19« 

78L05 354 

20 pes min 
No mixing 

2N3055 754 

5 pes min 




SOLDER ROLL 

SN60/40 .031 OIA 

$7.50 ea 

1 Lb roll 



=c:d= 



DIODES 

1 N914B SO.OZ 

1 N414e $0.02 

1 N4001 (lA/IOOV) J0.03 

1 N40O4 ( W400V) S0.04 

1N4007 (1A/1KV) S0.05 

50pcs min per it»m 

1N5401 (3A/100\^ $0.10 

1NS408 (3A/1KV) $0.12 

6A10 (6A/100V) $0.19 

SA100 {6A/1KV} S0.21 

10 pes min p«r item 

GERMANIUM DIODES 

1N34 $0.10 

1N60 $0.10 

1N270 $0.30 

10 pes min poritefn 



MONO CAP 



OQ each 
O.luF/SOV 
25 p<s min 



MIN ORDER S2b 00 ADD S3 !iO hOR SiH 
(SB.OU rOR CANADA) FLA RES ADD G'l. TAX 



CRYSTALS 

-^:::^ 

3.579MHz 
4.000MHz 
10.000MHI 
12.000MHI 
$0.80ea / 5pQ$ min 



60A26 



ELECTROLYTIC CAPS 



1uF/25V. $0.06 

Z.2/25 O06 

4.7/25 O07 

10/25... ,.ooe 

22^5 OOB 

33/16 005 

47/25 OOB 



100/25 $0.08 

220/25 0.08 

470/25 0.09 

1000/25. 022 

2200/25....... OZ5 

3300;ie 029 

470O/6.3 0.29 



25 pes min per item 



INTEGRATED CIRCUITS 

MC1458... $0.25 LM311 $0,20 

MC1488 $0,25 

MC1489 $0.25 

4001B $0.20 

40118 $0.25 

4013B $0.25 

4017B $0.25 

4028B ..50.25 

4050B 50.25 



4066B... 

4069B... 
74LS244 . 
74LS245 . 



LM324 $0.30 

LM339, $0.30 

LM368 $0.25 

LM386 $0.30 

LM555 S0.25 

LM556. $0.30 

LM741. $0.30 

7416 $0.20 

...50.25 7432 50.25 

...50.25 74LS04 50.25 

... 50.25 74LS273. S0.25 

...$0.25 74LS373 50.25 

10 pes min per item 



24 PIN 

MACHINE 




irrmr 

$0.30ea/10pcs 
$0,208/100+ 



CABLE TIES 



Gfc 



4" $2.00 

8"... $4.00 

Bags with 100 pes eacti 



TANTALUM CAPS 

1 UQ each 



^o 



1UF/35V 



20pcs min 
no mixing 

2 .2UF/35V 



CERAMIC DISC CAPS 

/ Q each 
25pcs min 
no mixing 
20pF/50V 100pF/50V 

27pF/50V 1000pF/50V 

62pF/5QV 10KpF/50V 



PUSH-BUTTON 
UINI-N.O. 

$0.30aa/ lOpca 
1/4" panel Ixila $0.25sa/ 100-)- 



^ 



MINI TOGGLE 

Sbbi UHLt 
SPOT 50.85 S0.70 
OPDT $0.95 50.80 



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/^ 



DIP BRIDGE 
50V/1A 

50.30ea/5pqs 
50.25ea/60+ 



1 N47XX 1 Watt ZEN ER 
lN4728Ato1N4764A 

1 00 each / 20 pes min 



CIRCLE 211 ON FREE INFORMATION CARD 




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^ \ ^ 




riEMHEPTHiZ HB'He LASER POfNTER 




OHilrin 1trtW nwi. H»«i IMT 11 VDC 
HMmr taa^), oftMa on BM britsrin. 
tompMi^ NiMjtiimd In n iikwM 

MM l5(nWtairdtetopoinlH'«uUilD 
iMMlnglh ilMnmi {B33nm, M 
unundto STtnni). HinutKlurad ty 

Mnw^f Effidknt for pMnMlorat 
ladum, Mc Rtqtikn a AA tatttrln. 



•BmoHTBiThM aoce poumts 
fmAUsmcMiY poceo 

fXHOED CCWSTRUCrm 
•UWOHHWILH 



Rstail price $140.00 
OUR PRICE. $85.00 



niMlENS LASER POfHTER^ 



ContaiRs 3mW gain guldfd laser dlo(te. 3 K 
caII battsrles 5ltr battery life, operates In high 
spwd or low pulM mooM. coniBS in s kght 
walgM iMie houslna, 4.? X 1^ X .7?, 
Indudet «i attTBCtfw vmodaii prasantitlon 
esse. LowMt p[ic»d dio<l« polnUr we know oti 

OUR PRICE OHLY. $110.00 



ITEMIGN3 LASER POINTER 

Contains Sony SmW Indax guided laser diods, 
i AAA tettariss, Thr ttaitery life, comes In 
rufloed aluminum tousina. 5.5' x .5", Indudes 
mlmi mnina csw, OUR BRiGHTEST 
DIODE POIfffEFIl 

OUR PRICE ONLY. $140.00 




1x1-3inWH»-HaliMrMM 

tx UUBI DRIVE iwwsr uippty. 

110/Z3tVACIiii»iil 
1i AC matot vlfli M*tMCHi iluininlzad mirmr. 

2l Intra-^ LED"! 

2x Infn-TMl plMto dotKtoft 

1x1.Ptp»al>r 

Zxmull Z.3V lim^, rad & gntn 

1x2* byS* levin (am 



ITEMF30U2 
BARCODE SCANNER 




•tn 
Rltli 



Gx 1* by S* Iraiit-Mirlles ■lymlidzsd minon 

1x1"byrX-Y»dJvtW - 

alumlDlnd mtrror 
tx 11 W^ VAC III DC adluttebla iMnnr tiprtr 



$1000.00 VALUE 

am mux. $mM 



dtpnding on rrantiMunr. 



m nCCADV- '"H^ -Mllliwilli(lglitpoww output) 
bLUabAHT. ifg^ . Helium Naon (red BflM) 

MBOH = laser that emits a UtM^reen light 
M ° Nano Meter (mveleffoli of llQlTt) (cotor) 



All lASR PWTS AB£ SOU) AS COHPONBflB ONLY WHEN ASSEMBtHimiS LASER 
MUST INCORPOHATB THE SAFETY REQUiREHEffTS Of THE CENTER FOR DEVICES AND 
RAWOLOSBAL HEALTW OF THE FOOD AND DRUG ADMINISTRATION. 



nmR690 ■m_ 

HaMBlASERWBE ' 

Pro)8Cts red dot up to 1/4 mile, .4 - 1 mW, Fx 1.12" 
6 momfi warramy. ^^ ^^^_ 

ITEMRSSO H$H9 LASER TUBE 

Projects red dot up to 1/4 mile, 3 - 4mW, 13.ff x 1.45" 
6 montli warranty. 



.$19.80 



OUR PRICE $K.i 



'/ 



BRAND NEW 

12VDC INPUT 

He-Na 

POWER SUPPLIES i'^ 

We stock hundreds of brand new 12 VDC Input He-Ke power 
supplies. Designed to operate .5 to 8m W laser tubes and heads. 
Typical dimeitsions: 4" x 1/2" x 1". Manufactured by Laser Drive. 

nBi22DHS2 Fm.smwToimwiAsms.mf.y.ifffififi.tio.ee 

ITBIIZ4DHS2 FOU 4mW TO BmW lASaS,.M¥M!!».fni«.^.Oe 

nEM21AN12 
BRAND NEW Hb-Nb 
POWER SUPPLY 

1 1/4' X 3 1/4- X 4 1/4- 'Potted" supply wrtth 'AJden' H V connector, 
in our opinion, ttm best He-Ne laser power supply curranUy 
manufactured. TTiese are direct from the manufacturer and will 
power 99% of a)l He-Ns lasers up to 8mW plus 50% of He-No's up 
to 17mW. 12 Month warranty. 

mtthnkcOai- noalfalshstt 

lICutiBtaiMdrtat 



IIVIg)A)taxlOS0-(0CHl)-t20VKt^0% 
Optnino AnoBntTtniptniiw 



-20tiDtSBV OUR PRICE. $XM\ 



nEMS6CNS2 
INFRARED VIEWER 

List price $400.00+ 

OURPHIOE. $2Se.W 

We now hxn intiwed Inaging tubes availablel Very hant-ti>-t1nd, bwid-new Van) 
6914 Imaging bibss an now fviHaMe In Rmlted qiiantltte. Ttns« units win convert 
new to iTM Infrared Ight to a visable Itnage on ttte rear phosphor scteen. TTwse are 

rirmiwinliMlnrnnTrTiihiiririiniinitji iinhhliiitiuiuijiiiiii Tliini Wi 

do not regiia tt»volig»<Bvkirig nelworicfor etecfrosttfc tocusiiio of the linsce. 
Onb i 15KV do eouma cipalila oTdehertm npnnknAiy .25 uA (mbnhAmps) 
SM 1he otjei^w and iyspteca optics an mqiWM to make a wartdng iTifiared nlaht 
vision devlcaatafiBcltanattlMnaniiaiprtce. 



-"% 



ITEM BOB 

H16H VOLTAGE 

POWER SUPPLY £ 

OUR PRICE. $80.0B 9 

High voltage power supply tor infrared Imaging tubes, new 15000 
VDC output, 9 VDC Input. 



wW\ 



iNDUSTRIES 



J-800-S56-7714 

198 LEWIS COURT 
COr?ONA. CA 91720 



<714> 278-0563 
FAX (714) 278-4887 



WE ACCEPT: VISA, MASTERCARD, C.O.D. AND PURCHASE ORDERS 

CAU. OR FAX FOR OUR CURRENT CATALOG! 



WANTED: WE BUY EXCESS LASERS, OPTICS AND RELATED PRODUCTS 

We are constantly expanding our product line to include more NEW products and are always iootdng for new sources of laser, optics and ^sodated 
hardware, if you are a manufacturer of any such equipment, we are extremely interested in marketing your particular line of products ttirougft MWK 
INDUSTRIES. 



I 
i 



o 

3 



CIRCLE 2S6 ON FREE IMF0FIMAT10N CARD 



60A27. 




CONSUMERTRONICS 



2011 Cfescant Dr^ P-O^ Drawer 537 
AlaniOQOrdti, NU 86310 

Add M S/H (USA. Canada] AH tiitnn in «Eock. COD 
(UPS cMh only], VISA. MCard OK. HW Cflli 



log hi 



At iMn on TV, John Wtlllami - fwinar 

LbctiliHd Stnbf Engln»ar, NM3U Cwnputw Sch 
VK* Pr^ssfror. SafUw-tdu MlhaiilLaimnwi ontif. 

*An «ortwaro suj^poilft All TBlUt-pC aom- 
paliblfl syAtoms (SOflfi - &D4$G), 

Vok* Lln« A Manuit Fu: SAMBPM Man- 
Sat, MST. Auto Fu: AH othflt Mnmt. 

(505) 434-0234 

FAX: (50 5) -43 4-0234 [otdeia only) 



Off-Thc-ShGlt HARDWARE 



Van £ctii Syttvm, Voloa Dliguliw, Shtiak 
Modulfl, Haarlna As^latcr, EM Cpuntar- 
ni«>,»urfe^ TENS^ BLh. San*a CqFnmtinEcH- 
tor. Sum par Bnapar, R«dar Emiltvr, Sub- 
timlnaf Mlxar^ HlArsnymut Machine, Nour^ 
ophorta - much morol DniaJti h our OUailq^ 



HARD DRIVE MANUAL 



Covaft afl hard dth/a ad^ confroRvr lnip4«mwHatb<n« 
jamphqli on PCi] Hom Id as^wC Nvfaca. hKlnl- 
Bta, tat Up, ina, marnteFn, Iraubtaifhool and rap«lr 
Uiam. How lo pioloci thi>m Irom mlititkaa, t«bo- 
l*0*. PO^ <y« ^<l Bii^^ linsart. Ho>f( to racowf 
dunagad and km ma*, htovr lo prwant erin,haf to 

b*g^ wUh. IndiH^ toftwara rfv^flwt, Loadfr^ wfth 



DISK SERVICE MANUAL 



MiHn(M% irtHi&MaiHOb n^wir. adjmt, ahgn Hoewv 
S-za'/a*, PC/XT/ AW3e 0/4 e», 



AppI 
, DEC 



modofff, Tandy, AUri, Tl, HP, DEC, etc sys- 
lami. An napotfis rwad teduiar uokMOL $79, 



DISK DRIVE TUTORIAL 



I naofy Sno pr kuch Tscti on riopw dnvaai tssus, 
FDCt, lExmatlfns, loftwara protadKin. SyalenM d*- 
•crlbed i^ova. Irwnluabta Mvkia and tlpa hi hew to 
bati aattcL blartnca 1^ uta dilvat and dkJu. |1 ft. 



COMPUTER PHREAKING 



hackar la>:t tllaa and uttl[lla«. «nd laaandary 
FLUSKOT* WDl«1kin*y9iam (Ed. Cholca^ PC 

Maqaztna). Dcatm or computar »1im ar»d abusa 
mvlnodi and cciuntafm«aaur>Hv How »y»tam« ara 
panatratad. BBS advka, p«i*WQfd dofaata, eloi' 
aaiy - much motat Manuala *■ DEtkt* %3A, 



BEYOND VAN EC K PHREAKING 



Eavaawoppng on vu i ano i v VKiao aioiaii tii4nB 
an (irfAr«iy TVI [>oajinanlad In a«eui% induUby III- 
aralura. Rarne up to IKM. Plana hnduda both tha 
C0M3UWEBTR0WCS and Iha oHglnaL TOP 
SECRET VAH ECK dailanil tSA 



CRYPTAMALVSIS TECHNIQUES 



erypto progranta {in 
ig] (o ---•■-- ■■ 



riva powanui nvanij-drFvan a . ^--m i-- 

.COM and Ihalr SAS foureasj lo anflyza, daoypt 
'H^ufa'* cl^phaflaxli. Woihad-nut a7»mp4a3. Hac- 
ommflndod In 1h« weillglous COMPUTERS & 
S^CUF^ITY. Manual * Dbsk' iza. 



SOFTWARE PACT ECTtON SYSTEM 



um^ua lyvlam Itw ntwtf dncotdfaga* fidtly vpn' 
wara piracy v^U not Intarfarfng wUi tagH an^hal 
nptea. No kncMn ww to dafaaL No apaalal at^ulp- 
mant raqulrad. fiJmpH and autofnatki la Inatafl on 
your dlttribulad aartwari. Can t>a ut«d wtlh any 
cfifiy-pTavaNJon ayalam. Uanualt + Ptth* t$9. 



VOICE MAIL BOX HACKING 



now VOwv Mali DDX \\/tAaf ,yn4nK tft utud 
■fid M tptcirio wiyt iKn ■!« hKkxl. Includat 
AS PEN, MESSAGE CENTER, BIX, EZ, 
SlfDNEV, PHONE MAIL, AUOIX, tta. Ab»- 
kjloV rtqulrod for oj] u«(Kt and ivtoou i29 



CELLULAR PHONE MANUAL 



Pfo ymm ad, Haw e a li it ar ayatama ara vutnarabla to 
hac« attacka, and cfiundafmaaturat. C«nprahan- 
«N« dbtcrlptlont On TnodiFytni; NAMi & ESNa (In- 
ctydina ipiKrilic in(o, on 30 popuJar rno<J*li)H tcan- 
ning, scannsf jestorollons {Jncludai UHF TV 
mainodji, fraq. Jk eh«nri«l allocailona, roaming, 
tracking, ECPA - mofai 139. 



PHONE COLOR BOXES 



M oeiignaa oy Knong Knraakti is phona eonr 
boxaa daacrtbad Oozana or G^rcuKa, a knulaior pro- 
grama. Rua call romranJlna conFaranckvo, phraak 
hlatory, ^0 isalul and lagd phona ctrcuH plana - 
morar $29. 



ROBOFONE AUTODIALER 



Pcwartuli 



vartaMia, rnanu-drlvan 



autodlatar lata ypu dial any numbar (up to loiK) or 
mta o( k«af and lend dblanca numt>Bf a h any otder, 
ovar any lanflth of nna, whothsr buev or an^wa^ad 
(ycur oho(»rand log tha tirnas, ctHnmoivd? end re- 
aulta io monitor^ nlnlar and-cxr disk. Quick-dial dl- 
racloiy dT up to OOO numtwa. BUSY radlad cwUof^. 
Dlrad modam command & oonlfoL Al Ftaautt Codaa, 
lncH>dtno VOICE and niNQlNQ. Qplkvial «h*| to lar- 
mkial proornm upon CONNECT. Ed to manu or DC^ 
{TorbAtcNngl}, Manual * Diak' iaa. 



ExeiMnf *Hotrlcal, atfcirEHiH and afaatromagnauo 
Iharapautlc, dlagnoatk and pravantlva davfoaa 
(iTK»(T|i' »Kpflrimflnl(d|, HWory, daaciSpttena, plan* 
jdOfan*). avnii^bi^U** of Radionica Oavicaa 
horn aariy to modam, Whia druai eoat $ Hundiada, 
alectricSy ooati pannM t29L 



HEAL THYSELF 



SoFna ajactTMiiQ aiKS atactrontaonaua maAoM Oa* 
vicea ara now Hoaraad by tha FOA (or Ihamplaa. 
Plana for (hraa ma|or davtn ^rpaa that TOU ean 
butid and iqa younaHl Swa $ ThouHMtdaJ Plu da- 
laJli on mafty otiwdtvtcaar lift. 



EM BRAINBLASTER 



Tuionai and piaot ror pcrwaitui ^lectbquaQ-' 
NET1C WEAPONS & LAS DEVICES. OrAimum 
drcutli^ fraqa,, Wavalotma, diXy cycFaa and EnEdnct- 
llo«, Compfahvnilva, MIND BOGOLINGI i2]>. 



HIGH VOLTAGE DEVICES 



HV davicfts plum' Stun Oirn, Taaar, Pfod, 
Can*, Flaahor, Blasler, Zappafn Audlo/FlF/ 
Radar Jammitr, Jacob'a Laodor, PEatma & 
Van da Graatr Gona., F«nca Chardar, Gal- 
gar Counlar, Ozena Oan., FJah Slunnar, 
ptani Stim., K!r1|an, mnrvl Qhocklnpl $SS 



SECRET & SURVIVAL RADIO 



upllmum aurvrval aiw 
methixla, fiaq^ aiJKidtona and vole«/data acrwri' 
bjing/anc^odln^, Indudaa amatf racalvariAFanimll- 
Isra, telatnfltry, anlanna opiimlzallona. ran^ota 
mon^pflng & corrtroJ. aaeuri4y, HJrvalllarKa. and uh 
iToaonicH Tibercpib & kifrarad coinmo. 70+ clrcull 
lan9, tabl«. $29, 



VOICE DISGUISER 



Piarv TOT naai owKn io ciwtga voioa pncftaa. bT" 
(acUva aqaJmt anoopa using vo4» analyaari, for 
womaa inldran & anriy Rwig atongi, for aril'lnlru- 
afon avatami, tor tiaa& Vofca aoun^ ntfural. % i a. 



STEALTH TECHNOLOGY 



r'friica taour ■ l aa c w iallngl R alao naa arror ratoa or 
10%-£0%l Evary known arror mod* - malhod A, ma- 
larial U94d Eo mlnlmifa radar raftadknii - locllc & 
atralDB/ to ^tH unjuql rad«f IJdtela (that coal you 
tlOOa in tniurance and flak c^wallallton) - mathoda 
to datad and lam ilgnali - ful^ iteacf^badl t20. 



STOPPING POWER METERS 



Aaraportedon CBS '60 MINUTEST H^m car- 
tain a!acLrJeal Fonda (vimpty pluas Into an 
outlflt) can alow down - even slop - watt- 
fiour maLaii - tvMllo using full loadaf Loiid^ 
may ba co^nec1^^d to any outtoti in system. Also 
daflcrftws rnDtor ccaiip, ovorload dfoop. ale, $19. 



THE I.G. MANUAL 



iinanw magnain woyi (appiwd io tha malar iiaaf) I 
to adow dowTi and vlop watthour mMan whKa draw- 
\r\a ful load*, fl B. 



KW-HR METERS 



How watthour maiara workc ca fi bfalion, a>rror 
(many). ANSI Standard*, ato. Dahand and Poly- 
pbaaa Matara^ &<parlmanial ratuHs to tkiw and 
atop (iHtars by dheti. £19. 



LIBERATE GAS & WATER 



lukMTwrTt, tlS, 



VORTEX GENERATOR 



ai or cool wfln aunpia^ ama^jno, s-port davica, I 
Usaa no fflcMns parts, atactrldty, fniM fu^, liqukJ, I 
Traoo, Guaranitaad acwnlincaDy toundF Plana. $14, I 



AUTOMATIC TELLER MACHINES 



ATM crimaa, abuaaa^ vuln4'rabi|Eti*a and 
dataala axposadl tOOi- matht>da dBtaJlad, in- 
ckjda: Phydcat, Hag. E, cipher, PLN compromlaa, 
cajd countarlfeltlnD, magni^tEc ttrlpa. taJsa r;onl, 
TEMPEST, laf^lng, spoollitg, JnakJa >Db, aupar- 
codI, vlt^alton, pUw, Nglii volaga. Van Edi - oth- 
ers. Ca&e UatooH, law, oountfrnwaiuraa, daldtad 
security chackltet, Wbatod fntwna' pholaa, nguraa. 
ATMa conlahn ijp to $290,000 In oaahl «3SD,000 
ATM cFtrn* aprm lUN umohvdl $39. 



CREDIT CARD SCAMS 



Cardholdara, marcnanta and uanni autrar v uiiorn 
ki toaaaa annual^ bacauaa cpf cradft eard fraud. Da- 
acrftwa awry known nieani c* cradt tard fraud ar>d 
tcamt. Prolacl youraaltl $29. 



CONS & SCAMS 



;a AmsricoTLs cx d w^ £> In ton pa I 

yaari Tha mwl wn^rahensivs turvivfll manual on 
cont & acamt of all kinds - Irom ihB clatsic to iht 
hkjh-iac^ Oatatti on hundradi artd ihalr many varla- 
llcni, Prolad vounalfl $29. 



SURVIVAL GUMS 4 AMMO 



Tha UMImate Flraarma Survival Uanua!l 
Deacflbaa optinrum gun« & amnto^ convaratofia, if 
lantara, aKploslva davlcaa, knprovliad waaponti 
End Tknaf aoioarloa, ratraott, aic 



ROCKET'S RED GLARE 



now Kj oatign ano iHwi a 
arvd lurvhral rochala, En»ha»li on tha fonnutatlon, 
manitfoetura and ^vlaMlon of propallants, motor*, 
Igntlwfa, ate. ]r>ctudai ttat of commonly AVAliabla 
nutariait, and tha daaSgn c< launch p[id« ond tcsl 
bada and Ihalr alaclronfba, tZB. 



SPECIAL PROJECTS 



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LASERS 



Laser Pen 



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60A30 



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PC BASED OSCILLOSCOPES OUTPERFORM 

STAND-ALONES IN COST AND FEA TURES 



1 



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INTRODUCES 
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SySMWriW • 

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Comparison Chart of Chase Scientific PC-Oscilloscopes 


MODEL # 


CSlOO-40* 


CS60-25 


CS40-25 




CS20-25 


PRICE (probes not iocL) . 


$795 


$695 


$595 




$495 


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FOR INFORMATION PACKAGE CALL 1-800-866-7899, FAX (408) 479-8572 

OR WRITE TO CHASE SCIENTIFIC, 7960-B SOQUEL DRIVE, SUITE 191, APTOS. CA 95003 



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How to troubleshoot digital Integrated circuits — includes micro- 
processors, what goes wrong and how to find it, how to use the 

best literature on IC's and where to get it (1 hr. 45 min.) $39.95 

How to select and hire the best electronic technician. It takes 
one to know one, and believe us, ttiey are not all created 
equally excellent. Ttiis tape will save management and you 

a lot of grief if it keeps them from hiring a dud $39.95 

TTie best money making Ideas I know. (For anyone contemplating 
getting into the amusement or arcade business- Shows how 

to do It right the first time.) (56 min.) $39.95 

Videogame Repairs (for arcade games). (36 min.) $39.95 

Plnbalt Repairs (for arcade games). (44 min.) S39,95 

Videogame monitor repairs and adjustments 
(for arcade games). (31 min,) $39.95 

OUR NEWEST TAPES 

Job opportunities and money making opportunities 

in electronics. (45 min,) $39.95 

Pinball Theory (tor arcade games). (1 hr. 29 min.) $39.95 

Videogame Theory (for arcade games). (1 hr. 1 2 min.). ,.,... $39,95 

Troubleshooting and locating component failures, (t hr. 10 min.) $39.g5 

Power Supplies — Linear and Switching. (42 min,) $39.g5 



VIDEO REPAIR SCHOOL 

(601)287-1594 



P.O. BOX 813 -RE 
SELMER, IN 38375 



CIRCLE 279 ON FREE INFORMATION CARD 











DiSTRIBUTORS 



*• • * 

TVT-G-COMBO ... 

DPV 7 XXX 


JERROLD * 


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TB-$60 FTB-$60 TBD-$60 




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* * * LOOK * • * 

Wc will match or beal anyone's prices who is advertising 

in ihis issue of Radio Eleclronics with the same wairantj' 

on items listed in this ad. 

We ship VPS & Federal Express 



*■ * • 

PIO PLUS COMBO 
PIOSB^ 


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PIG 6110 










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fift.OO 





OF SILVER SPRINGS 



.Ali products cojiie with One Year Waminlj. except for 
refurbished item.s. which come with a 90 Day Warranty, 
All returns are subject to a 15% to 25% restocking fee. 
Orders called in by 2:00 shipped sairtc day in most eases. 

SCIENTIFIC ATLANTA 

• •* HAMLIN *** 

COMBO 110.00 

CR 6600 120.00 

PAN 55.00 

* • * OAK * * • 

* * * ZENITH * * * 
Z-XAC 200.00 

.Add $40 per unit for flash. 



COMBO ... 


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110.00 


RTC56 




IIS.OO 


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To Place An Order Call 904-625-9545 

NO REFUNDS ON SHIPPING CHARGES. CASH OR MONEY ORDERS. SORRY, NO CHECKS. 

]| i\ EinMbe inlcnT of Sun Coast Dis[, of Siivcr Springs id Jefrjud jnv pay "Pv' iipcniEOr and wc ^ill aol d.vsiit any Crtmpanv ur irutividunl in doing the wmc 



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60A33 




in a Computer! 



P 





— Testing an analog three- 
stage amplifier with the 
^ simulated oscilloscope. 



CIRCLE 247 ON FREE INFORMATION CARD 



lectronics WorkbencH 

PoTverful software to build and simulate 
analog and digital circuits. , 



Building and testing circuits is fast and 
e^symth Electronics Workbench. 
Just click-and-drag with a mouse to 
add parts, run wires, and adjust 
instruments. The traces on the 
simulated instruments are the same as 
you'd get on real equipment 

Electronics Workbench really i^ an 
electronics lab in a computer. It's ideal 
for learning about electronics, 

^xp.eiimenting, Jnd^piatQtyping 

Circuits. 




Testptg a gate impts^tentatton of three differentJlip-flops. 



Includes: 

• Analog Module with passive and active 
components including transistors, diodes, and 
op-amps; a function generator, an oscilloscope, 
a multimeter and a Bode plotter. 

• Digital Module with gates, flip-flops, adders, 

a word generator, a muUimeter, alogic analyzer 
and a unique logic simpHfier. 



DOS Professional Version - $299 
Macintosh Version - $ 1 99 



(416) 361-0333 

Interactive Image Technologies Ltd. 
908 Niagara Falls Boulevard, 
North Tona-n-anda, 
NY 14120-2060 

Fax (4l6) 368-5799 



.^- ^ 

"Electronics Workbench is pretty amazing." 

- Jerry Poumelle, PkD., InfoWorld 

"... Electronics "Workbench is a marvelous 
learning and teaching tool for the study of 
electronics." /' 

- Art Salsberg, Editor-in-Chief / 
Modem Electronics Magazine 

"Building a circuit is simple and intuitive." 

- Jejf Holtzman, Computer Editor, 
Radio-Electronics Magazine 

". , . if you're trying to learn electronics, you can 
do 10 times as many experiments with Electronics 
Workbench ..." 

- Jeny Poumelle, Ph.D., BYTE 






INTERACTIVE 



SKtmma WorklXiKh Frofcsjional Veiiion runs on inj- IBM AT or PS/1 or true compiiibit ulii 640 KB RAM; Hicroioft-tompJlible motue; EGA/VGA jnphics; hird disk; K^DOS 3.0 or liier. 
Monochrome version ilso dvalUbtr- M ^dnlosh Ver^n (monochrome on^) nins on Mxcinlosh Plm or grviter. AH irademuks ut Ute [m>p«rty of their respective owners 
Prices are in US dotlm. Olfer viUd In the USA uid CuuuU only. 



CIRCI^ 247 ON FREE INFORIMATION CARD 



K 



DC/CAD 

introducing. . . 



THE TERMINATOR 



Super High Density Router 
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■ Real-Time via miniinization 

■ Real-Tiiue clean up passes 
<• User defined stnst^es 

■ Window 3.0 capabili^ as DOS Task 

■ 1-mll Auuq>lacer and Autopamung 
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• Automatic Ground Plane w/ Ctoss-Hatclung 

■ Complete w/ Schematic & DoUy tibraiies 

m Optional simulation cairability &. protected mode for 386 uscfs 

* PCB LAYOUT SERVICE AT LOW COST * 
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Design 
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1T71 Suuc Hi; 



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Wind Generators 
Generator Rewinding 
Welder Plans 
Electric Scooters 

It's back! The LeJay manual odginally published in 
the 1940's is now back In prinl with even more plans 
than before. This manual Is now a complete collec- 
tion of LeJay's plans and general inforniatlon on 
6, 12, 24, 32 volt wind generators, generator re- 
winding and rebtiilding, propeller building, battery 
powered spot welders, braising welders, solder- 
ing irons, fencers, scooters and bicycles. DC mo- 
tors, 1 lOv welders, spot welders, generator wel- 
ders, insect exterminators, geiger counters, light 
plants, and much, much more! Written for the 
common person to understand, this manual is a 
must to have tor its educational value alone!! 





To order send check or money order for $14.95 

plus $2 shipping and handling 

($4 shipping and handling outside USA and Canada) to: 

LJM Inc.. P.O. Box 174. Dept. R, Lake City. MN 55041 



en 

I 

CO 



c 
p 



mnRK V €L€CTRONICS, INC. 

Competitive Prices * Fast Shipping Since 1985 



A indicates the level ot diftlculty in the assembling ol our Products. A Beginner AA Intermediate 
^y^'tM/l/^ Special offer will be given to the purchase of Amplifier + Metal Cabinet + Power Transfonnerr 

" New: 



IN CA 1-8Q0-521-MARK (Orders only) 
OUTSIDE CA 1 -800-423.fi VE (orders only) 
ORDER BY FAX (213) 888-6868 
CATALOG & INFORMATION (213) 888-8988 



AAA Advanced * Fully Assembled 



^PV^-i^' 300W HOSFET AUtJlO MONO POWER AMPLIFIER 
Ue-3 AAA 

Pcwtr oulmrt: 300W fnlo « ohmi (0 1 ^ 
1HD1. 2C0W into fl otims (0.0!S TH[)) • 
fiequcflcy ft0S[»onsc: 10 Hi - M KH2. - 
Total Karmonic Oistsfliorr Less Ihfln 
0.03S -Input Sensnivity and lcnp«lance 
It 1 XHs. IV 4?V U • LiHd ImpHltnce. 4 
-lEDtims.-PDvwrRequirfmflnis ±S5[0 
±6SVDCaA-<Each Channel) -tJwen- 
sion& 2B7 I ?05 K 60 mm 

1Z0 W MOSFET POWER AMPLIFIER (MOHO) 
TA-477 AA 



lOOW « 10CW NEW CLASS A DC STEREO PRE AND MAIN AMP 




tfl t1ES m 
Astmblljl i Time: SISS DO 






fi'J' 



T RO.: Less Tftart Q,0O7% ■ Power ouTp uT 
1 20 watts rnlo 8 ohms RMS ■ Frequency 
(espDnw &Hj (o 2IJKNi * Q-G,^ dB 2-6 
Hr to 65 KHz. • 0-3d B ' Sensflm iiy: 1 V • 
Power requirements. 55 VDC 3 amps. 
May uu Ujrk V Mode! 0Q3 Translomier 




TA'15O0 AAA 




Kit' S73.70 
AaimblBd t Ttilid: SfiS.BI 



120W 4^ 120W LOW TIM PRE-MAIN STEREO AMP. 
TA-500HKII AA ^ ^ .. 

titm load 72 wito uch ctuniMi ifilo B oHfn 
•Mi FfKnttncyresponie lOto^OWu TolJii 
furnwr.t Oisloflicn, Less ihjn 01*i Tixw 
conatoi 5ii5£. s i^dS M\a 1 8d3 Htgh * 
Sdfl SwSJilviry Pnunoiiipui 3mvin!Di?K 
Line. .3 V inu 4? K Sijrul Id iichm ifita ^ 
dB Po«ir«nrirerriern:I>C i ^tOVOCi] 3,2 
JiL Bchnmud DC. ±;4aV[K:M5 4A4ahnt 

dm hud. AC^faVAi^D-ZflVACM 1 D.B Awtn 






F'Owlir (iittjMt &Q lilies p«f cttinnBi mla i otims 
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dmortiafi Lfl»1tUi:i0a3SFri(!<qu<f!ncvre5fWn5< 
Auj inpul 5 to iO.OOO H/ * Q 2de -7 dB - Fr<- 
auewy rFsponu Power jrri[]tinei mcEidm DC ta 
2D0 KK; ■ SeffiEiUvtr^ Ptiono. ^invai7< Am 
t&|]mVe47KU<CmV«1DKQu1pjl TjpelfiO 
mv O 17 KPr«fflp IV c 600 Ohms -Pw^r 
trtreimmEf ?fiV lo 32 V AC x ? O 6 A iMarV V 
liiwWOOiF-P.C 8si!(iOimtnwrti I0 5"i6l3" 
t2E5'< Hell unkS 13-i2 S3' 1 3'i.EjLii Uu ran 
mosiAi catonei lG i^i or lG 1925 

SOW f^ sow PURE DC &T£REO MAIN PQWER AMPLIFIER 

TA-aOZ AA 

Power ow[pu1 .60 watts pei cftarjnn into 6 
ohms Total hairrnann: dtstortiori' iBiS than 
05s ai rat&d po.'/e'. Inlcrmoctutalhon dis- 
loriion Less trisn 05^ 31 rued fiowtt Fre- 
OOsriLyrffsponseiD.CioZOOKH: -Odti. -MB. 
e 1 v^tt Pcmcr raquimmfiriCs: ^ 'MC x ?d & 
imp May use Marit V ^odeJ (lOl rrttnslpmieF 
P.C. aojrc) S-V^'iS'il -i;S' Heas ink; 5- 1^8' 

120W + 120W AC- DC STEREO Hl-F^ & PRE-AMP. 

SM'720 A A* „ 

Pwtti Qutpui 1 20 W P^ muuc. p<ow«T ouTpiJi 
per channel fripul Sertsitrvir/. Ta[)«300mv, 
Aux 300' fiiv, Ptionu 3 mv, Mic 3 mv Tune 
cgntroJ rangi? Tt?Ci1e * 8 die. B<9ss :£ 3 (13. 
Frequencv Respoinse MHitoZOKhjr Pgwtr 
RcfluiremBOtfi. 110 VAC. ?20 VAC. Sfl/BO Hi 
12{o 16 VOC. Dimeaons- 272k ?08x80 mm 
Cwn^lfftt KIL $S3.oa 10 5m J 8 1/B I 3 IB inch 

AtUfflbllA A Tnttd; £M.4N 



TA-aOZ AA 

Kit- (4&,M 
Auimtiltd A THUd: (S9.72 



VIDEO AU DEO SURROUND SOUND PROCESSOR 

Slyl-333 AA-:^ 

FfBQuency fesp<inse 20 Hj to zokh? • Total 

harmonic dasturTlon Front channel 0,05%. 
Real char^nel' Less than 0.25^* ■ Inpul signal 
vohage 1 to 3 5V * Oiflpirt Ffon; cha/inal; 
1 (0 3 5V * ulptrr Ff cmt channfll 0- 1 to 3 .5V 
• Rear channel 6 SV < Delay tiine. 5 to 50 
m«lii5econds ■ input irnp« dance- ^7 K »P<rftiii 
reouiT^rrwnJs- 1 00- 120 VAC. SQ»i » Diman- 
CHmpiflte KH: »73 W nons 1d 2* wide l-BT dMp 2.T hiflh 
Anambltd A Tsiiti}: $«5.0[| 

SOW + 60W STEREO POWER AMPLIFIER (WFTH MIC INPUT! 
SM-302 A A* 

Frequency response. 20Hj ro 20' KH; - TotaJ 
rwrmomc distortion < O.IS * PtMisr output". 
SOW pflf channel inio 4 ohni Ind • 33W per 
c^anflel I nio S ottm kud * I npu t sinsrtiviiy. MJc 
lOmv ■ Hi SaOmv ■ Lo WOnw-Slgnal W nasi 
\ fsim* Better iJiar> 70 db *Power consumplron; 
tQOW Dimcnyon3i60mmx75rroTn200Tnrrl 
Complttfl Kh: SSQ OD 

AtumbiBd ^ Tejttd :$4S (U 
Rack Maunl Meial Cabinets 
with aluminium panel are 
suitabta br many projecisand 
most of ourktls. 




Q 



^ 




We provide iranslonnars (or 
most our Mark V amplifier 
k'lts. 



oftV- I tM OC Wt ilvp by UOS q'wj'^ *Ti<i*t Ift (T^i U D0» an3 iNp Iw US ft*! 

' -~:L»h4^rtA.v0?a(Lir>>Mjnjinrr »Qu4^|D«Vaiume(}iu:ountj'j<ljUvi4)ai4tMiuMt ■Rrutenn 

.'tw. ^t^ ».i.t)|«ci 111 criiirign wntnowl .pier /lacv Wir 4iTi rt« tirHOWUa h3f [rfWQtillWJD vrrcHs 



Business £ Showroofn liouts (Paatic Ttmcji 

Mon II1TU Fn 9 30 am To 5 00 tir^ 

S;it lOOOamiij^ r.: i - 



MARK V FXEC TRONICS. INC. - 8019 K. Slauson Ave, Mnntebello, CA 90640 @ ^ 



CIRCLE ZS7 ON FREE INFORMATION CARD 



60A36 



±L 



THE ELECTRONIC GOLDMINE 

^ X MINIMUM ORDER: S10.00 plus S3.S0 Shipping and Handling ^ 

^ We accept MasterCard, Visa and Money Oilers i 

X Call or send for our free catalogt X^ 

, P.O BOX 5408, Scottsdale.AZ 85261 

PHONE ORDERS (602} 451-7454 FAX ORDERS (602) 451-9495 



COPPER CIJ\D 
BLOWOUT 



Great for making high quality PC boards, 
TTiese are slandafd giass ^wxy dojtte 
sided copper clad bianks. Size te an 
inctedible ir K 12", Each Panel is large 
enooglt to make many smallet PC boai±. 
I A Super Value. 

G2869 $2«' 



COMBO TVA'CR 
REMOTE 

Hmi hem remots 
made by Zerilh 
We just 90t tese 
in and have no 
other info exce^A 
thiit)eyta«alBw 
sciatdies on the 
case. As is. 
G2555 
$1" 



wow; 



f 'V 



• SPECIALS • 



BRIGHT 

ORANGE 

LED 



Junbo T13M dilbsed Ims, oiange l£D. 

G2554 10/$ l* 

100/$9~ 1000/$70 



24KHZ ULTRASO^aC 
TRANSDUCER 

High output ubasonic 

Vlrarsducers Iw use in 

IremolB control ^. 

G951 $1* 

100 / $125«» 



rn 



G936 



STROBE 

■wm & 

SCHEMATIC 

Brigft xenon tube 
ior making ^obe 
ligrts. Size:U'. 
$1» 



INFRARED 
EMnTER/DETECTORS 

Brand new prime assently wtti 
4 goU case sensiliw 
deiBtlors and 4 gold case 
sensitive erriillers. 
G911 $1" 



SUreR TRANSFORMER 

Ore oi the most useful tieavy duty dansformers *e haw ever 
seen. Great tor various power si|)plies, briery charges, 
nkaj quick chargers, etc. nintary standanj 120VAC. Sec- 
ondaries are as foffcws: »^ile teds 18VCT 1 arrp, blue 
leads 23t/CT2 amp, red leads WCJ 2 amp. You gist all biree secondaries on one 
trarBtonDer. Fsalues oofiper shielding arait windings, heavy du^ lamhations 
and ccmpact six 2 5/16^x1 ^jG" x 2 W. Open tame type with mouthg hate. 
G2713 $5* 



UWERTER 
TRANSFORMER 

Cotwls W or 12 VDC to 
owr 250V when L£ed with a 5K IC 
circuit (schemata included), Gred kr 
portable strobes, black light tubes, etc. 

G993 $1" 



SOL\R PANEL WITH 
MINI-FAN 



LOW COST FIOOELECntIC 

TONE ALERTS 

hnry plastk: case pieinelectrc lone akrts produce'^' 
a loud tone when 12VDC is applied, however they 
can ei/en produce a tone at M)i. Sis betinieen 



G2935 99<: 



mourting eats 1 1^ and tfametEf of unit is 1 1/4*. Wlh king wre leads. 



ELECTRONIC PROJECT KITS 



Greet combination of one of on 14V0C 
110ma solar panel (ffx 12^ aid asmafi 
mini-Ian that operates when sunshine 
strikes the panel. You connect the Ian to 
the panel wfft any wires you choose to 
use. Special Combination Value, 

C2873 $21» 



INEXPENSIVE GEIGER 
COUNTER KIT 



Probably the k)west pticed Geiger Counter kit 
available in the workj today! Featues sensitive 
thin wailed Geiger Mueller tube and speaker that 
emits clkte ir propcrtbn to the radistion bel. 
Detects Beta and Gsirma rays. Opsrales from one 
W battery (not 
Hickided]. Only 

C6447 
$39«5 



r.B 



120VAC 3 CHANNEL 
aXOR <»6AN KIT 

Very popular 3 channel color organ causes Hgfts 
of your choice (up to 200 watls per channel) to 
flash to the beat and freguency ol your music. 
Connects to stereo speaker and operates torn 
standard 120 
VAC, Board 
soe: 3- x 5", 



■i] Jo '0^0 J^t 



C4530 
$129« 



O .12VDC lAMP VARIABLE 
POWER SUPPLY KTT 



oocH 



o ^ 



-^ FS5] \ 



^ 



This is one ol the mag useful kfb to have around! Featues 
wriable output from - 12WC filaed ^ i|] to 1 amp. Uses 
IC voltage regulator and heavy duty transktnnet, Abo telutes 
red, yellow artj green [IDs that glow at difletert output 
votegK to show approximate oUput votegs - no need lor 
meters, Oj^tates from standard 12aVAC, aid is great lor 
pcwering projects, cakirlatots. radios tape player^ elcL Six 
of boar* 5* x 2,75'. 

C5177 $185» 



Kits are complete viith ^11 parts 
PC IxwrtI timl instructions. _ 



*BiD fOR otm rms gutaloq 
fEATUPma otm oom>lete uhf of jots. 



20W + 20W 
STEREO AMP KTf 



Two seper^ hi£^ power amps on one PC board 
put oU an incredible 20 watts HMS each. Features 
low distorton circuby, Gre^ stereo booster arrp 
tor your car souid system. Use witi any speakers 
eatable of handifig at ii8st 20 wads. Operates on 
12VDC. Sis o{ board: 6* X 225' 

C6442 $19^ 



INFRARED DETECTOR KIT 

Great br testing and vefilk:lk!n of rilrared oUtpuL 
Uses sensitive sensor and electronic circuitry to 
respond to ail types of infrared TV, VCR, eb:. remote 
controllers and LPDs producing sound and KgNing 
a bright red LFD. 9V b^ry (not irdudedj. Size of 
board: 2 5" X 1,4", 
Complete with all 
parts, PC board 
mi instnjctians. 

C6441 



FAST SERVICE -FAIR PRICES! 



CIRCI^ 241 0)4 FREE INF0RIMAT1ON CARD 



60A37 




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BIG PROFITS IN 
VIDEO REPAIR! 



Work from home-Earn $85 HR! 

-NO EXPERIENCE NECESSARY- 




Only requirement That you possess average 
mechanical ability and a desire to learn 



With the tens of millions of VCRs and 
Caiticorders in use, there currently is 
a serious shortage of trained techs 
to perfonn cleaning and repair jobs on 
these popular devices... Lean^ 
how you can start your 
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video sen'icing < 
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And since 
up to 95% 
ofallVCRand 
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simple mechanical or 
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failure, you need not 
spend months or even 
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professional service work! 
Let Viejo's Training Program show you how! 



1-800-537-0589 

or mail coupon today! 





VIEJO PUBLICATIONS, INC. 

4470-107 Sunset Blvd., Suite 600 
Los Angeles, CA 90027 

Yes! RiLsh me vnur FRKE OPIM^RTinsm KIT today! 
(Check appropriate box) 

□ VCR Repair 

□ Camcorder Repair 

Q Advanced VCR Repair 

□ Fax Machine Repair 

Name . 



Address 

Citv/State_ 



_Zip_ 



21 

UJ I 



Dept. R.E I 



60A38 



CIRCLE 278 ON FREE INFORMATION CARD 



HE 
P@WERH<S>LJSE 



Power Conversion Software and Components 



INDUCTOCAD II 
DESIGN YOUR OWN MAGNETICS FOR 
SWITCHING POWER SUPPLIES 

Desigu yutu uwn pcwu iib^ictunl Eu.y [□ uw ififtwarc 4lkfim qmi^ kcutj^c dcst^is. 
ItKludcs dat&bucs fi:^ Fcmlcs, ptTwdcnl iron, MPP, Kooli^ E. pot iod tOfOid aatvit. 

iod coK linit&, mc Wioi^ «-i£h wnutow Uk4 5G«ns on a PC. For dam diit sand S2. 
rcrLmdflibie Euwirc^ purcbve. 

Piit No. TCA»52»t/5%-diit)<3r!CADMi»(3W''clHto) $139*95 

POWDERED IRON TOROID CORES 

^tKr<■>'tuctaii f'2 imtaidt -in.Nx! pcrwci irxtbaru uj«s a- lOOkllj^ AHvt Uitsc tviwijic 
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pKkafcc (f foiti of Ibc mwi us#M com ym un tuni lalo jqductorL TlWH wm tax ^<.v><i 
fH^fli pcw« Icveli of 1 OQmW to 1 OOWatB, Ourcxdiam^er frcm 0.2^5" to I i' 
\'c-v,a ti'ire *ot*cr*OH pockige Part Nt>. fCSf^tW 3I Z>9S 

TOROIDAL POWER TRANSFORMERS 

Isfw cxltnul field. EjtCdLlenl K%\iiat]i.m a.' 1 0% ^t^ai (u'l l04d Id tail load. 

iJciJ loiCu-.nitrucIicnc.frAR BATrKRY ("i.lMPlATOR 



'i unary 



1 l5VAf 



! 15 VAC 



IX' ihitpiii 
after Rrcl, 



I 5V:'5A 



I5V/10A 



I 15VAr 15V !4A 



ticitjhl 



J.8" 



4.5" 



Widih 



1,7" 



2.8" 



Prii; 



46. '>5 



72.50 



2.4" 79.25 TRON1514 



I'art No. 



TR()N1505 



TRt)N 1510 



TorokdjJ trausfLiftiKR f^^ tja txlf™-.AUow^ 85-132 V'Af ' opefaliun of Um? ]cjl reglUjUrti- 
T.iMHltHl . Axkl m AC uipLil filtci iD6 diudc pxk to ulsjn Power Supply til to tmufbrtncr. 
AC film ami diode pidc Pjit No. FACTRSM SH .« 



i'rimiir^' 



120/240 



120/240 



120/240 



120/240 90 



VA 



36 



45 



75 



Matches kit Pan No. 



KJPSOSOS/XIPSOSOS 



KIPS12O3/KIPS1303 



KIPS 1205/1 305/1503 



KIPS 1505 



Prices 



38.95 



41.50 



46.95 



J. 



PartT^Jo. 



TRONPK36 



TRONPK45 



■[■RONPK75 



49.50 TRONPKW 



SWITCHING POWER StPPLY KITS 

KiL.> include. All tompouoits, PC bouA Hcu &iuk. .Sdicmaui:, Assembly dnwmf;. iDductoI 
dcRgn, AsMnibty- instructions. Test pmccduic. fTomplete boiid diiflcnsiaiu 3 J*'*^.^^' I .^' 
T>Tsjcil «ilfKiency>*OS Add « DC input filter liJ yotn bosnli fas Wwer mptitociise. This a 
.-.^^cnlial for Audio and AhhIar applications. 

nr nitci pmNo. fdclnsm um 



1 n p ti t 



X - 4 (1 V [M ■ 



h - 4 V [) C 



1 5 -40 V DC 



15-40VDC 



l7-40VDr 



1 7-40Vrj<.- 



1 8-40VDC 



I «-40VDC 



(1 u I p u I 



5 V / .■? A 



5V/5A 



1 2V/3A 



1 2 V / 5 A 



1 3.SV.'.?A 



1 3 . 8 V ,' 5 A 



1 5 V / ? A 



1 5 V ' 5 A 



Piice 



.^ V . '.) .S 



3 7.95 



.^9.95 



3 7.95 



39.95 



3 7.95 



1 <) . 9 5 



Pan 



No. 



K [ P S .5 3 



K I P S 5 5 



KIPS1203 



K.IPS 1205 



K I P S I 3 1 



KlPSl 305 



KIPSl 503 



K.IPS 1 505 



HOW TO ORDER: 

Cbcck cir luuiay (nda. FleaM na COI/a. CA nsidmls add ippbKabie sak tai. Mb orOa 
Sin.OO»j:kidiiighjailliii£dn^«. liackr$2CI-O0.S31uiidln]Bchxrfe. KimnalLTPS freighi 
charEH apply, ov(imi£h[ >cntn ctUfRC Nn^shipinctii (k-> PObo^« [■'^kcs subjoa tk} chaiisa 
witbcTUl oofice. A full copy of coiKliiiofu of 533* upyo wTiKen rtqucst 

sendorfer^tct THE POWERHOUSE 

801 W. El Camino Real Suite #268 

Mt. View, CA 94040 

Call (415) 964 2428 Fax (415) 969 9581 

ITS Fnegllt duifies: GtoUDd 15.00. Seccod Day Si,00, Neu Day S 1 5.D0. 
rv.;r:^ - .lislts Uupped by siandonl post, NVC 



CIRCLE 301 ON FREE INFORMATIOH CARD 




POWER PINCHER 

Now there's an easy, inexpensive way to save 
$5, S10 ... $20 a month or even more on your 
home energy bills. Power Ptncher reduces the 
miergy used by your refrigerator, freezer, washer, 
;or any other major AC electric motor-driven appli- 
ance in your home by as much as 60%. (Li- 
censed from NASA under US patent No. 
4.052,648.) 
$19.95 eac h 

LIQUID 

CRYSTAL 

SHUTTER/ 

VARIABLE DENSITY FILTER 

0,5' 10 0.9" active area. 0% to 23% transmission. 
Operates up to 250 microseconds. Specs In- 
cluded. Only $9.95 each 




^ 



BINOCULAR 
GLASSES 

These sporty tool^lng 
glasses are actually 3x30 bincx^ulars with locus 
independently adjustable for each eye. Quality 
lightweight construction includes two sets of inner 
lenses: dear and tinted. At outdoor sporting 
sventsonsunnydaysorwhilesurveyirvgasnowy 
landscape, the dark glasses can be switched In. 
Volla! Binoculcir sunglasses! $7.95 

SAMSUNG 
VAR ACTOR 
TUNER 

Covers TV channels 2-83. Operates on 12 VDC, 
46 MHz output. Spec sheets included. 

$14.95 each 

RESISTOR RIOT 

1/8,1/4,1/2 Watt, povifsr , p redsl on , fixed , adjust- 
able, etc. Thousands of pieces. 

5 tbs. for $4.95 




•^ 



MOTOROLA 
68000 

10 MHz CPU with 

socket. 

$7,95 each 



386DX-20 BARE BONES SYSTEM 

Intel 386DX CPU on 8-slot motherboard with 
Phoenix BIOS, 2 MB RAM, in case with 250W 
power supply. New. $219,99 

Actd-on accessories available- 
Call for system quote. 



EXTERNAL DRIVE 
CASES 

For PC's & oomp^bles. 

7.25" X 2.5" X 12". 

Brand New 

$4.95 each 



/ 




50 WATT 
SWITCHER 

1 1 5/230 VAC Input. Outputs; +5V @ 4A; + 1 2V @ 

2A; -12V © 0.2A. Small size, approx. 6" x4" x 1". 

$14.95 each 

SILICON VALLEY "GOLD" 

Over 50 pounds of printed drcult boards from 
computers, monitors, modems, test, RF and 
microwave equipment, all stuffed with goodies 
such asteroids, IC's, switcties. sodtets, connec- 
tors, oscillators, crystals, transistors, diodes, 
varactors, varistors, elc. A gold mine of usable 
parts. 50 Lbs, for $49.95 



SOLAR POWERED 
FLASHLIGHT KEYCHAIN 

Find that keyhole at night! 
$4.95 each 



General Electric 10 KVA 
ISOLATION TRANSFORMER 

Strappable for 2:1 , 1 ;2 or 1 :1 . 1 10/220/480V in 
and out G.E. model 91 22B4006. $195.00 

General Electric 5 KVA 
ISOLATION TRANSFORMER 

240 or 480 VAC inputs, 1 20 or 240 VAC outputs. 

G.E. model 91 22Y4311. $95.00 

OTHER MODELS IN STOCKI 

50 Lb. CARE PACKAGE 

Surplus goodies from Silicon Valley. This is not 
Junk, Just material we've acquired in quantities 
too small to catalog: electronic and mechanical 
subassemblies for everything from robots to 
rockets. Assortments may Include IC's, caps, 
connectors, bearings, diodes, hardware, circuit 
boards, cables. Weird and wonderful stuff. We 
often get re-orders, so we assume most folks are 
happy with 9ie assortments we send. 

50 lbs $49,95 





2C39 VACUUM TUBE 
$49.95 each 



ATARI 2600 TRACKBALL 

Also works with Commodore computers. Smooth 
ball bearing action. Cable with DB9 connector in- 
cluded. (Dealer pricing available.) $9.95 

ATARI 5200 

TRACK BALL CONTROLLER 

Use as-is or dismantle for a treasure trove of 
goodies such as; HEAVY snooker ball; 5 ball 
bearings; 2 optical encoder wheels. ICs are 
CD401 1 , CD401 3, CD4030. CD4538 and CA339. 
Also 34 resistors, caps, 3 diodes and one transis- 
tor. New,unused. $12.95 





14-DAY 

PROGRAMMABLE 
ELECTRONIC 
TIMER 

Originally used to oonlrol a satellite receiver 
through its IR port at a distance of up to 23 feet. 
Time on/off for eight distinct events. Modify it for 
your needs or dismantle it for parts. Program, 
mable with a 2732 EPROI*^ in a removable "per- 
sonality" module, the unit may be modified to 
control any IR remote controlled device through 
its I R port. Contains Z8 CPU, dock display and as- 
sodated parts. Operates from 9 VDC 500 mA wall 
transformer whidi is Induded. BRAND NEWI 

$19.95 each 



HAMLIN MODEL 

MCC 3000-3 

36 channel, channel 3 

output. Used, working 

condition. 

$14.95 each 



STAINLESS STEEL HARDWARE 

Popular sizes used in electronic work. Assorted. 
May contain capsaews, Phillips. Sizes 4-40 and 
uP; 3 lbs. $5.99 

100 GAUSS 

CRESCENT 

MAGNET 

Show^n approx. 75% 
size. 
6 for $9,95 

TTY TRANSCEIVER BOARD 

Withassemblyinsiruotionbooklet. Convert ASC 1 1 
terminal or computer into ham or shortwave 
AFSKRTTY, $9,95 each 

RARE SURPLUS 
FIND! 

6ALS Vacuum Tubes V- 
from the 50's in original .'^j^j; 
"Unde Sam' boxes. ~^t 

$1.99 each 

20,000 TtJbes in Stockl 

CHANNEL 3 VIDEO 
DEMODULATOR 

This module (removed from cable decoder) con- 
verts the channel 3 signal to composite video. 
Operates on +1 2V DC. With documentation. 

Two for S9.95 






MINI RELAY ASSORTMENT 

5V, 1 2V, 24V coils, unused, tny to thumb-nail 
sizes, mixed. 25 for $9.95 



<tl 

I 

m 



z 



ViTien in Reno, Nevada 

Visit 
ASCII Electronics 



ALLTRONICS 

2300 Zanker Road • San Jose, CA 95131 



Visi[ Our 

RtUiil Slort- 

M-F 9 - 6 

Sal. 10-3 



Q30992 



VISA - MC - AMEX cards acoeplsd, Minimum order $t5.0O.Ga(ilomia residents add 8.25% sales tax. SWppitifl additional on all orders. 

Phone (408) 943-9773 ■ Fax (408) 943-9776 



CIRCLE 231 ON FUEE rNFORMATION CARD 



60A39 



JDR Microdevices 

2233 Samarilait Orhe, San Jose, CA 95124 



BUY WITH CONflDENa FROM JDRl 

• 30-DAY MONBY BACK GUARANTEE 

• 1 YEAR WARRANTY 

• TOUFREE TECH SUPPORT 



I 



JDR CATALOG TODAY! 

lOR H'i, iOfTtmU, MOHIIOIS, 
BUR HWU, liYMARDS, MOfif Mi, 
UIUS, (OMHIOORS, ICS, 
COflPOHENTS, nWGUUUUItS, 
niT KHINUKT, TMU t MMHI 




1 6-BIT VGA CARD t AO^^ 

• 8/l(S-bit 81)88 or j^^^J,..- 
2e6/3S&''1A6 minpiciblc j^^B'^f- . 

• 640 1 480 in 16 colon "^ 
320 I 200 in 256 colon 

• 2S6Kb video RAM 

Ma-veit4« (4t.is 

MCt-WS«-l014» 1 02^x7*8, il 2 Kb VGA cod 1 1«.»5 

MCT-IBIFM li-biilDEhord/iioppj-controllef JM.fS 

MCMDEIO ] 6-blt IDE Hoppy/hord mufri I/O St*.9i 

Mn-«IO Sor.al/porolW/gomo port cord H9.95 

MCT-AIOi. Two NS165$0 isfral/por/gorrw port tlf.fS 

Mn-fDC-HD 1.44A,4bfbppyi:ontFiilkn' 54f.95 

DFINH-4(I« libit Eihernrt cord $149.95 

CATIKEEPit PC iKUf i»y cord J49.95 

PCOO£ "'ogrwiHcdiipkiycQrd $49.9f 



Smb DRIVE PACKAGE 

* CP-500K-S W4Mb, l4m^ J['J 
hirtl Jnvt, l6-bit noppy 
hard disk controller, (.jbl'. '. 
ind insnncEioru 

»KITIO $31T 

IDE HARD DRIVES 



$319 



PUll 



CP-WM 
ST-iSU 

n-3MM 

iT-J1441 



42M 
42U 



13tM 
13IMb 
212Mb 



nrPE 



3.S"fDE 
S.S'IOE 
3.5" IDE 
3.5- IDE 
3,5- IDE 
3,5- IDE 
S.IS'JDE 



PtKE 



Sl« 
SJ« 

S319 
S37? 

S5« 



FLOPPY DRIVES 

, FBD-1.44A i .4dMb, 2.S'. 6e\qe . $79.fS 
I FBD-I.44X 1.44Mb, 3 JVBIo<:k.$ 79.95 

FRP^I.l 1 .2Mb. 5.25', Baigg $19.95 

nft^tO 3iOKb, 5.25-, Bloct $79.95 



uhiversal « , 
prograjhmer""^ 

• Progmm! EPROMs. CEPRO^tI,' 
mkroproccs^n, PROM^, PAi/'GALs 
Kid other PLOi; r«b logic & mcrrOTy dcvicM 

• Opijonil odipiora ivulible for PLCC. PGA, QFP 
uid multiple DIP drvicB 

• Includes Hke uJipLor card uid cable 

■OMKIP $H9.M 

EPROM PROGRAMMER <11Q95 

• Projsnmj 2A-i2 |im LPKOMi .-^ W''' 
EEPROMi from 16K-IU24K 

• Hci to OBj coEivertcf 

• Vpp5.12.5, 12.^5, 13.21 4l25Vl 

MOD'MEP' til 9.45 

MOB'MEP-4' 4-EPi;OMproer<inim9r unll tl«9.95 

MOD-MAC HoitodciptorcQtd Arable $39.95 

*Notp Require! ftoit adaptor cora 

EPROM ERASER <3995^ 

• Qukkly and vimiilianr' ^ 
iXUf II $3*.*5 



$499< 



HOH'IHTERLACED 
VGA PACKAGE ^g 

• 0.2i!mrn doc pir l^ JS ^ 

nnn-intcrliced nuiiri r 

S: hijgh.rrsdutton VGA t^id 

• Reiolulion up to 1024 k "'6fl 
[ 256 color** 

• )L2KbYldcoRAM 
rxpindsblero 1Mb 

VGAPXG.I014K un.n 

VGA- PK 6. 1014+ 1 024r7ii inltrWed VGA pig , 

VSA-PKC {>40:c4SO .nlerJoCed VGA pkg, 

V«A-M0N-1 034 1 Q24i768 lolerlcxcd rnonller .. 
Ve*-MOK- 102411 1024i<7iS rKm-fnlirtoaxI mon. 
*Hatt. Rh{i/i«*i )fAk,KAMkr 1 024 x TAS in 2S« colon 




$44f.9f 
$}4f.tS 
tJ49.fS 
JJW.9S 



ENHANCED 
KEYBOARD 



Hi * ' ^ ' "■i«-" ■ tV'UAiSil 



$49 






195 



IK-MJ»101/102-lau'«il>oocedlQ)™( S4»,9S 

3-BUnOM MOUSE j^! 1 1 4^ 

• .\ccuracy 2;>l).in(l DPI I--" 

• Opttj-mcchaniiral d«i^(i 

• Windowi ^.0 compitibjc 

1 JBI-MOmi-I $14.95 

, MOUn-rU $4.95 




DYNAMI 


CRAM 


■ 


2i 


mT 










PACT* 


SHE 


SPUO 


riH 


P8KE 


41SSM0 


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Nh 


DIP 


1,M 


413U-U 


2»1(il 


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2.)9 


4142SM0 


2UKi4 


■Oiii 


DIP 


4.9S 


IMI« 


IMiI 


u» 


DIP 


5,99 


IMI-M 


IMii 


Mn 


DIP 


4.49 


4nSUW4(] 


2iM!i9 


Wh 


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14.95 


t125«Atl-M 


UtK I 9 


Uh 


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14.95 


41100Mn-10 


1Mi9 


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».95 


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4 MS 


424OMA4I-I0 


4Mi9 


u« 


SIMM 


169.95 


424M0AH-M 


44ll4 


UHh 


SIMM 


174.95 



MATH CO-PROCESSORS 

EiLch cO'procciiar includes a manual, 
loftwanr^uidc and InEcIS lifetime warninly. 



rmi 



U67 

>Dt7-3 

M217-IL 



SPUD 1 PUKE 1P«T* 



JPtEDl PUKE I 



SMHi 89.95 t(1387-5XP 33MHi 199,95 
JMHi 129.95 80387 DJP ilSMHl 119,95 
12HKi 94.95 80487-5X MMHl 499.95 



BREADBOARD 
ON-A-CARD 

• SolderlHS bn^.ldbolrd | 

with I'O. decode & 

timing? cjrcujtry 

Pft^«01 e-bitcod $79,9S 

rai-411 16-bil version $>9.9S 

WIRE-WRAP PROTOnPE CARDS 

JH-rai e-bitwilb I/O decode Irryoul 124,95 

JH-MIO Ubllwilh I/O decode byoul )34,95 

PORTABLE IC TESHR 

■ TcbK tSe jblltjwinK 1 I lu ^Ct-pm 
dtvito: "!■( serin TTt, 10 8: 4i series 
CMOS * 4 1.'44 series DRAM up lo ! Mb '' 

■ Identifies uolfoown pin niimbets 
tMK .. ) 1 19.95 



MOTHERBOARDS 




20MHZ CACHE 486SX $ 549 

• 2OMII1 Intel HWSaSX CPi; • S'JKb uthe memoty 
on board (expandable to 256Kb) • EKpaitdiiblc to Cr 
32Mboti.b«ird ujiiigiSfiKb, IMbor-iMbSIMM^ 
f0Kb insiilled) • rncludei Intel's "VacaiKy* socket 

•KTWMMIX $549.00 

HCI-M4t4.SII Mini-siie 50MHz cocbe 4S6 S 1 195,00 
MC1-M4ti.}3 Mini-jiie33MHicocbe4e6SB9S,00 
MCI-C3U-40 Mlni-sla40MHi««:hw3e4 S499.9S 
IIICI-C3«6-13 Mini siu 33MHi cochis 386 J449.9S 

MCI-Mai6-35 Minisiie 2:5MHr 3B6 $349.95 

MCT-M3t4»-ia Mini-siio 20MHi 3B6SX $199.95 

»n-M386SK Mini-iiiel 6MHi SSiSX $ 149.95 

Ma-«286-l4 Minliiie 1 6MHi 286 $ 149.95 

IKI-M»4-t3 Miniiiie 12MHi2e6 $119.95 

■CT-n we-i a Mini-3iuio/4.77MHieo88..$t9.9S 



UPRIGHT CASE $99'^ 

» AccojnmoJares std. mprherbowds J m 

' Mounts 5 floppj- and -1 hard drives ^^^ 

* 2 di^ir LED display ^^B 

U$t-100A 199.95 ^^ 

PS-3S0TW 250 W p. lup^y S 1 29.95 ■ • ■.-- 

PJ.3WTW 300W p. supply 1 149,95 ;' 

CASE-50 Mini 236-iiyt( cose $59.95 -' 

CAf 1-70 Std. 2S4-slyt<i rase $49.95 •!;'/ 

CASE-llO JI99.9S ^-Jl^ " 

I Mini-uprighi coia w/200W pcwer supply " ^ ' - 



POWER SUPPLIES 




III. jpprovixl 
• 1 l(.l'220V. iO/eoHt 

K-1S0 8088 ISO »an T S69.95 

W-IOOX 8088 200 vratt SI9.95 

W-lOO 284/386/486 2001™* $»9.9S 

M-ISO 286/386/486 250 vmtt $I19.9S 

K-JOO 286/386/486 300 wtt $149.99 




2400 BAUD MODEM 

* Intertill dae.i itioJcni 

■ Hayes ATcnmp.itiK.li;. 

• Incl. ProOiititn iOtT\sjfL 
liCT.341 $«9.»S 

2400 BAUD EXTERNAL MODEM 

■ 2-t(JO'12«l'3IKI bind • Just 6 25 1 VK 1 1 incliM 
PI0-14«( i«9.9S 

9600 BAUD EXTERNAL MODEM 

• a;iTT V.42bii.V,32/V.22bis/Bell 11 2A & Hayes 
ATcotnpatiblc • Asynchronous / synchronous 
M0.9H $J»9.»I 

FAX/MODEM SWITCH 

* Save phone line cliafgesl • Supports fax, motlem, 
phone and answering machine from I photic line 

FUM-SWnOi $119.95 

lU-nnrai Wl<hiiuliT>sdeinc<zin«tion . $09.95 



z 
8 

c 



@ ORDER TOLL-FREE 800-538-5000 

ZE^ FAX ORDERS 800'538-500S TECHNICAL SUPPORT 800-538-5002 



TECHNICAL SUPPORT 800-538-5002 



60A40 



CIRCLE 248 ON FREE INFORMATION CARD 



NOW OR0CR 

34 Hoaiti 

a DAY! 




Microdevices 



2233 Samaritan Driven San Jose, CA 95124 



BUY WITH COHflDEHCE FROM JDR! 

• 30-DAY MONEY BACH GUARANTEE 



• 1 YEAR WARRANTY 

* TOLL-FREE TECH SUPPORT 



MMC 



m LOGIC 



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NEC V-20 SERIES 

The NIC V-2(li can impravc performance by up lo 
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• Uscisuperaet of SOSSinittvctiorii 
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turd ware 

• Lew power CMOS design 



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Df5aiP110H 



«iui7: 7ni>»yn .r tmrnm mxn un o.n 

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17.96 


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59.8S 


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17.95 


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19.96 


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SERVICE MANUAL FOB UNIOEN "Eiport" Redlot 15.00 
SEBV IC E III AN JALUCI '2360 10M Xcvr. MCWI 15.00 

SEBVICE MANUAL BCI-5SOO/6500/8500 VHP Marine Transceiver 17.50 
UNDERSTANDINGtREPAIRINGCBRAOIDS. Lou Franklin. 21b, Sniclii 34,96 

ENGINEERS SECRETS OF RADIO. Tube AmfisModutallun tlps/Scfianutlo/TVI 16.95 

CB PLL OATA BOOK. New International Edllbn. L. Franklin 19.96 

CB TRICKS OF THE TBADE. Test/peakiniAnlennst^ I much mora 16.K 

CB TRICKS II, Scnamallcs ol popular linaarampsi mora 1S.9S 

C8 TUNE UP MANUAL. Master Edition. Wial to cuttweak modi., etc. 24.95 

CB TUNE UP MANUAL, Master Ed iVdL It. More into on popularievrs 29.96 

C8 TUNE UP MANUAL. Master Ed. .'Vol. 111. AddiUonal InIn on other equip. 34.35 
RADID SECRETS. (Satni CB) Partormanco Improvements on Amateur* 

CB tnmniltlea/amplrllersjntods/etc. Vol. 1-30 Reg S20.00^ol. 14 95 

SECRETCBIItdel.LiatlntibymodelnumbefandarllclB 2. 50 



Monday - fMaf 7:30 a,m, - 5 p.m, PST / 10:30 a.m. - 8 p.m. EST 
•EXPOBT •O.E.M. 'SERVICE •R*D •AMATEUR -MARINE 

SHIPPINOMETHODA LHARG ES: MlnlnntmOrdtrKDm 

BEST WAT Un OROERS RECEIVtO BEFORE 4p.m. PST (T an. KTl SMIPPEO SAM DAY. 

.'f'dcral ti(pr^5s Ajrtx]fn*.' DHl .■ USPS ar« alM mrlabte 
GRDOHD SERVICE. J-? workana darys tmax.l OEoendmg on dasurtatjon in conttg U.S. 

$4.00 mmimum Add S 50 rKx pound iixrt& 2 pounds. 
2-DAY AIR SERYICE: UPS BLOE. 56 W minrmum. Ud IIOO per powd Ibon 2 pounls F«d(inl CiVIOS ll» 

a^'a^ljblc i: 53PF ^n^roe. ^a COD. AJasm > Hivak t Pufirlo Rico .' Cinaru. No COD. Please asktcr ctu/pes 
NEXrOAYDELIVERY:UPSnED.S13.6anii(iiniumAsltlH shi)iplng cluigts above 1 1t . 

5;iturday' delrvfr,' a^uUM^ tor addjruoal (10.00 
PAYKEHTMETHOO: PREPAIO mm check oi money order Parsoial checks must tiaw prisnnted addim and uir 

lifrjied 10 (40 DO. Checks rftumad tor Irntifficifiil tunds wiU basulijed to a t2000 cttarge. Any over- 

uymant will be returoKJ 

VtUMUTtnOARD WCDltd 

0.0,0.: Add S4 00 UPS ctiarge CisA. Casb lars Oieck. Mqnev Ontat , or Pra-ipiHVnd Conipany Ctieck on)f 

FOREIGN: Bant otittk 0.-ai>n on U.S Blni:. «r VISA/MASTERCARD. 

WIRE TRANSFER: Cwilact US for account inlo'nHbcn. 
OPfN ACCOUNT: ^jat 30 accoontsto linns ntiosa credit has b«tii pfa^ooioved 
CALIFORNIA ^i'.4!>iaaildi(ipfOHuusatBaL 
FORflGM: SIAALL PACtET: Wul Air sfapniM tor smill ontais ol parts (8,00 up to S o:.. 4 % mai. S^'iS* bo> 

AIR PARCEL POST is available on Uiger Hams. InsurjnctfReBStrmijii a ntten avalhbte. AdwH if oesmd 

CAHAQA: $5 50 rranuoum ^ppinQ/turtdlina cha^ t^ to 1 lb tor poslat 



ORDERS ONLY 



1-800'RF-PARTS 
1-800-737-2787 



NO TECHNICAL 



MAIN ORDER LINE 619-744-0700 INFORMATION 



CUSTOMER SERV. 



619-744-0750 

(10 a.m. -4 p.m only) 



TECHNICAL 



FAX 619-744-1943 FAX 






RF PnRTS 

BOX 700 
SAN MARCOS. CA 92069 



I 

i 



CIRCLE 2S8 ON FREE INFORMATIOH CARD 



60A4 




SILVER PLATING ON-THE-JOB. 

COOL CONDUaiVITY. 

CONVENIENT ANYWHERE. 

Cool-Amp is a proven product that silver-plates 

high amp connections (any connections) on the 

job. It is very simple to use. Simply clean the 

contact and apply 

with a damp rag. 

Cool-Amp adheres 

permanently. It 

is equal to 

electroplating in 

performance. 

Use Cool-Amp to reduce maintenance time. 
Use it on all current carrying connections. 
Prevent power losses and overheating from 
copper oxide. Time-tested for over 35 years. 

ORDER FACTORY DIRECT 







Cool-Amp Conducto-Lube Company 

1 5834 Upper Boones Ferry Road • Lake Oswego, Oregon 97035 
(503) 624-6426 • Fax (503) 624-6436 




60A44 



IF YOU NEED 
A CONDUaiVE LUBRICANT, 
YOU NEED CONDUCIO-LUBE. 

Conducto-Lube is an excellent lubricant which is highly 
conductive because it contaiBS pure silver. Gonducto-Lube 
was originally developed for use in high speed air blast 
breakers to improve conduc- ^^^_ 
tivity and lubrication. (Other ^^^B ^''"X 

lubricants are often non- 
conductive, even resistant.) 

The uses of Conducto-Lube 
continue to expand — from 
switches and breakers, to 
electronics and virtually any 
application where a conduc- 
tive lubricant is needed. 

Conductivity is demonstrated by Inserting It 5 VAC test prongs 
into a container of Conducto-Lube and establishing a circuit. Ptioto 
sliows low voltage (115 VAC) continuity through a container, 

ORDER FACTORY DIRECT 






Cool-Amp Conducto-Lube Company 

1 5834 Upper Boones Ferry Road • Lake Oswego, Oregon 97035 
(503) 624-6426 • Fax (503) 624-6436 



I 
I 

-A 

m 

a 




CIRCLE Z2a ON FREE INFORMATION CARD 



60A45 



CO 



-LnSER 

Visible Laser Diode JVIodule 




■ 40 mm- 



Light 
Aperture 




16 mm 



This miniature Module contains a Laser Diode, Drive Circuit, 
and Collomating Optics enclosed in a rugged, anodized 
aluminum housing. Operates on 3 to 6 VDC. Runs for hours 
on 3 AAA batteries! Data included. 2mW, 670nm output. 

Cat.0VDM-2 $99**** 



Complete Helium Neon Laser 




Dimensions: 

6.3" Lx 2.2" Hx1.4"W 

This module contains a He-Ne tube and matching power 
supply, ail in one housing! Comes with instructions and a 1 
year warranty. Makes an ideal Science Fair Project. Operates 
on 12 VDC @ 600 mA. 
Output: Visible Red 633nm continuous. 

0.5 mW Power Output Cat. #HNKD-10 $59*** 

1.5 mW Power Output. 3 times the power as above! 

Cat.0HNKD-15 $75**** 



Helium Neon Laser Tubes 



gp 



Tested 1-10 2mW used tubes. Dimen- 
sions 93" to 11" length x 1.2" dia. 
Operates on 1500VDC @ 4.5 to 6.0 mA. 



^' $10°° 

Specification Sheet 
Included. 

Cat. # BT-11 



He Ne Laser Power Supplies 



Specification 

Sheet 

Included 




$3500 



Tested, used Switching Power Supplies for 1 to4 mW He Ne 
Lasers, operates on 10 to 14 VDC at 1.5 to 2 Amps. Output: 
1500 to 2000 VDC @ 6.0 mA, 8 KV Start Voltage. Dimensions 
are: 4J5" x 1.5" x 0.8", requires an external Heat Sink. Works 
great with the tube above. 

Cat. # LPS'1 



C.O.D.'s Welconne. Minimum Order $25 , 
FREE CATALOCt 

on these and other related items. 

iilERcDi lH INs iRUmENTS 

5035 N. 55th AVE., #5 / P.O. BOX 1724 / GLENDALE, AZ 85301 
PHONE: FAX: 

602-934-9387 602-934-9482 



TECH-SYSTEMS 

WE BUY AND SELL ELECTRONIC TEST EQUIPMENT 
(800)435-1516 1 Field St. Avon.NJ 07717 fax; (908) 774-1 tX» 



IKlALJBAnE 

POR TABIF 

.J2SCaXOSCQP£S 

Tek 453 50mhz $295 

TBk454 ISOmtiz $450 

Tek 465 lOOmhz $695 

Tek 475 200mhz $995 

Tek 485 350mhz $1,495 

Tek 2465...300mhz $2,995 

HP 1710 200mhz $595 

HP leOD 50nnhz $295 

Tek 5000 & 7000 series lab 
scopes & plug-ins available 
(Tek7603. 7613. 7A18A, 
7A26A, 7B53A, 7B92A, and 
many more in stock) 



HP 800 series $295 

HP 8690 series .from $395 

WavetekaOOl 520mtiz $1,095 

HP B620C mainframe,. $795 

HP 8640B 512mhz , .$2,595 

HP 8640B 1024mhz $3,395 

HP8672A2- 1 8ghz (*«)Cffl«4 ....$9,995 




141TSp«ctrum Analy»r 



SPECTRUM ANALXZE^ 



HP 141T mainframe $8^ 

HP 85526 IF section $895 

HP 8553B 0-110mhz...,$795 
HP8554B 0-1200mhz$1 ,295 

HP 8555A 0-18ghz $1,695 

HP 8656B 20-300khz...,$795 

Tek 7L5 Plug-in $2,850 

Tek 7L13 Plug-in $2,900 



HP mnk Signs! Gsnanttir 

W.G.TFPM-43 level meter $400 

HP 331A distortion analyzer $350 

HP 334A distortion analyzer $850 

Tek 575 curve tracer $495 

Tek 576 curve tracer\fixtur# $3,396 

HP 200CD oscillator $100 

HP 204C\D oscillator $195 

HP 651 B oscillator $295 

HP 654A oscillator $525 

HP 3200B oscillator $250 

HP 5320 series counters from $195 

HP5328A counter $395 

HP 415ESWR meter $195 

HP 3406A voitmeter $550 

HP 400EL voltmeter $195 

HP 432A pwr mtr\cabIe\mount$395 

HP 435A pwr mtr\cable\mount$895 
MANY MORE ITEMS IN STOCK 



10 DAY UNCONDITIONAL RETURN POLICY 



60A46 



CIRCLE 252 ON FREE INFOHMATiON CARD 



CIRCLE 273 ON FREE INFOHMATION CARD 




MCM now has game controller rubber replacement pads lor tlie most popular 
computer games on \\>e marttei! These pads replace commonly worn directional pad, 
A&B response pad and select slsrl pad. 




Game Boy Type (For One Game Boy) 
#83-1570 ^Vh, 



5125 



Super NES Type (For Two Controls) 
#83-1575 ^ZJX 



SJSD 



Sega Genesis Type (For Two Controls) 
#83-1580 ^ 



StB9 

'i1-9) 



SI 69 



Game Bit Drivers are used lo remove 
tarnper-reslstani securily screws found 
in many Japanese made consumer 
electronics. 

• '/i" hex size can &« used with a slamlard ',r hex nut 
driver or most rechargeatile scfcwdiwers" 1 <if length 

■ Black anodirsd stesT* Made in USA 

Available In Two Sizes: 

3.8mm Game Bit 

• Used la remove s la r shaped secunty screws tound 
on most Nmiertdo NES ana Game Boy ear tndges 

#22-1145 

4.5mm Game Bit 

• Used IB remove star stiaped security screws lound 
on the Super NES and NEC Tuibog tatx game systems 

■ Can be used te open Sega cariridges, Mmlendo 
Game boy tjattery packs lor service or Ni-Cad battery 
replacement 

#22-1150 



Game Bit Drivers 



JQ50 



sqgs 



'|5-ii;.( 



DwcttQ 





ALSO NEW! 

T^HgUUk VCR Service Cassette wilt) 

G" Function 

Outperforms the others in quality and perloinancal 
Operates all VHS makes and models including the 
new "G" chassis Throw away your old jig and 
update your VCR lesl bench wllh this tiigh-quality 
service cassette today' 



MCM ELECTRONICS 

BSD CDNGHESS PARK DR 
CENTEHVILLE. OH d54SS-4D7S 

A pneMiea company 



#32-3840 m%, n^f,, n^^i 



lO'up) 



Tlie prii:es shown rellect || 
the latest Intonnation 
available. 

To order, or to 
receive a FREE 
MCM Catalog... 
Call Toll Free: 

1-800-543-4330 

OR FAX 1-513-434-6959 




RES-02 



CIRCLE 2Se ON FREE INFORMATION CARD 




PELTIER JUNCTION 
$20.00 

PELTIER JUNCTIONS ARE BACK I!! 

The pettier junction ts a 

thermovottatc device. Current applied to lite 

device will produc« heat on one side of the 

device and a cold surface on the ottier side. Atso, 

heat or cold applied to ^e device will produce a 

voltage. Approximately 1,17' x 1.17' x .12", ttiis 

little wonder is any hobbyist or experimenter's 

dream come irtiel! HOW FT WORKS ; ttiermaJ 

energy is extracted from a region thereby 

reducing its temperature, then rejected to a 

■fieatsink" region of higher temperature. 

DOCUMENTATtON INCLUDEOMI 




ELECTRONICS. INC 

eta PAGE BLVD * ST. LCXJB, MO 83130 

(31 4)427-61 1 6 

933i CHESAPEAKE DR. ■ SAN OIEGO, CA BZIZS 

(61 9)279>€802 

2SaS FEDERAL BLVD. * DENVER, CO 6021 1 

(303)4&3-5444 

MAIL ORDERS CALL TOLL-FREE 

1-a00-6e9-5810 

ELECTHONJCAliy SPEAKING, 

QATEWArSQOTlT! 



^ 



MOTOROU AMPLIFIED SPEAKER 
NEW $29.95 

The perfect addition to handheld rnobile 
oF>eration. Lots of audio power (1 watts) and a 
large speaker for audio clarity. 
Operates from 8 - 16 VDC @ 

1 00 mA. Great for any 

requirement for an amp and 

speaker. Includes mounting 

bracket, connector kit, and 

hook-up instructions. 

Approximate dimensions : 5'X5'X2-iy2* 



^ 






X-BAND TRANSMITTER KIT 
$39.95 

Great for testing and calibrating radar receiving 
equipment! Go wild with the latest state-of-the- 
art technology using teflon PCB, microstripline, 

surface mounted parts, and OaAs FETe to 
prove to the world that rt is possible for a small 

package to do big things... and talk about 
Impressive buzz words! The X-band transmitter 
is ideal for testing long range X-band receiving 
equipment approximately 15 mW on 10 GHz 
With FM pulse modulation, CALTTION: this 
device will activate radar detectors up to 1 mile 
away. Kit comes complete wHh ail parts, 
schematic, and 2-1/4" x 3-3/4' x 1" cabinet to 
give yoLir X-band transmitter a professional 
appearance. Operates 
from a 9v battery (not 
included) 




K-BAND FEED 

HORN 
$3.50 (new) 

As used in radar 

detectors and 

jammers. Idea) to 

design into an ATV 

system, etc. 



V , App 



rex. 1-5/g'x 1-3/8' X 9/16' 

THE FINE PRINT: 

PRICES SUBJECT TO CHANGE WITHOUT NOTCE 

• aATEWAY IS NOT RESPONSIBLE FOR PRINTING 

ERRORS • MASTEFCARD, VISA AND DOCOVER 

WXEFTED ' $10 MERCrtANDtSE MINIMUM ON 



MAIL 0TOER8 ' FAX OflOERS TO (3141427-3147 

ATTN: MAILORDER DEPT nNCLUPE PHONE 

NUMBER • SUPPLY OF SOME ITEMS tS UMrTED 

PRICeS DO NOT INCLUDE SHIPHNQ * UFES 

Ut«EHTAIN, EAT DeSSEfTT FIRSTI 



99 




nen 




I Secrets for Resolving 
I Software and Hardware 
I Problems 

I $34.95 

! A comprehensive, easy to read 
I computer troubleshooting 

I manual that can be used t>y professionals and 
novices alike. The Compufacts manual contains| 
I important technical information that is needed 
I when servicing computers. The 193 big pages 
I are full of facts, illustrations, and a wealth of 
I information based on the 'hands-on' experience 
' of the author and other service technicians. You 
I also receive access fo the COMPUFACTS online 

I Bulletin Board System. With a modem you can 
conned to this online database to download 
I device drivers and jumper settings of US and 
J offshore computer products. The manual also 
I features many manufacturer's technical support 

I and BBS phone numbers. Once youVe got a 
copy, you may wonder how you (and your 
V computer) ever survived without rt!!l ^M 



I 
i 

I 
m 

3 



^ I 



CIRCLE 243 ON FREE INFORMATION CARD 



60A47 






TOTAL SECURITY 




ALARMS SECURITY: 

• Police monitored or direct phone dialing systems 

• System package kits or individually sold. 

• Available in wire or wireless fire/burglar systems. 

• We carry and make top of the line Motion Detectors, 
Smoke/Heat Detectors, and Glass Break Detectors. 

• As well as: Computer Alarms. Car Alarms, Life Alen 
Systems, CCfV, and Door entry alert. 




SURVEILLANCE/COUNTER SURVEILLANCE: 



• Telephone tapping, bugs, transmitters, receivers. 
Scramblers for Voice, Cellular, Phone, FAX, Modems. 

• Tapping dcieciors. Bug detectors. Tactical Cameras, Voice 
Dcscramblers, Night Vision Systems, Covert Devices. 
Encrypted, and Di.sguising .systems. 




PERSONAL SECURITY: 

• Caller ID Phone: Di.splays the caller Phone Number, 

• Touch Tone Decoder: Decodes and displays Phone No. No 
need for telephone company subscription. 

• Programmable Scanners: Top Quality scanners that cati 
also receive car phones and cordless phones. 

• Voice Disguising telephones: Nobody will recognize your 
voice, even your Mom. 

• 80,000 - ] 50.000 Volts Stun Guns, Immobilizing Guns, 
Tear Gas, and genuine Mosquito rcpeller. 



FREE ARimWX SCASSER ASD VOICE DISGi'ISlSG 
TELEPHONE DRAWISG EVERY MOSTH 



To obtain your guaranteed lowest prices info package plus our 
products catalog — send $5 "REFUNDABLE", when 
ordering to: DIRECT SALE,S CENTER, P.O. BOX 1074, 
MOORHEAD,MN 56561. For inquiry call: 701- 232-5107. 



WE ARE YOUR BEST SOURCE 
FOR TOTAL SECURITY 



.j*';^ PRICES INCLUDE 
JilSUSANCEMiRMAIL 



VISIBLE LASER POINTER PEN 



Suit teachers, doctors 
businessman, and other 
professionals. Improvp and 
enhance all your 
presentations. 



^ 




: a l^it. but a complete 
commercial pen sized laser 
pointer at an incredlbie pricel Smali pen sized 
body. Runs on two smali AAA batteries. Battery 
life; 2-10 hours. Visible 5mW red (670nM) iaser. 
Pro|ecls a visible red spot at more than 150 feet. 
As used for medical treatment by some doctors S H ^Q 

and acupuncturists. I Hi? 



I.R. NIGHT VISION HELMET 
MOUNTED BINOCULARS 



,:>.....»wi^'"^S;,|,^ 




Binoculars wilt c^pa;:«^;>Vr 



Higli quaiily miiitary binocuiar 

i R vrewer. Seif powered, and 

originaliy intended to be 

mounted on a helmet, Focus 

:s adjustable from 3 teel 1o 

5. _,\ , infinity. 

Requires 

some I.R. 

Illuminalion 

Powered 

by one 

: Single 1.5V 

battery. 

Limited stock. 




^549 



I.R. MINI NIGHT VIEWER 




HLTEBS 




cffi:; 



A very small complete kit. Includes 

both an adjustable lens and an 

eyepiece Simple construction. 

Instructions provided. Draws only 

25mA from the 9V battery. I R. 

illuminalion is required irt (he dark, and \ 

good ranges are possible with |U5l 

medium powered focussable torches. 

fitted with an I.R. filter Kit includes 

the I.R. tube, lens eye-piece, §■< QQ 

electronics kit and the case kil. I «7«7 



3 



I.R. NIGHT VIEWER 



A very small telescopic monocular IR 
viewer. The assembled scope has high 
quality military grade oplics. and employs 
a pretocussed I.R. image converter tubs. 
This tube has a useful response from 600-1300 
nf*t. thus also making It useful when working 
with I.R. LEDs, and I.R laser systems. The 
scope has provision lor a coaxial E.H.T 
connection, and is supplied with a power 
supply kit. Ihat features a ready assembled 
mvener on a smali PCB The power supply 
easily fits into a smali plastic case, and can be 
fitted with a belt clip Also supplied' At a very 
small fraclion o( its real vaiuei 




OATLEY ELECTRONICS 

5 LANSDOWNE PARADE, OATLEY 
SYDNEY NSW AUSTRALIA 2223 



PHONE 

jst Coast betw 
Coast between 



ORDERS 



ORDERS 



CIRCLE 309 ON FREE INFORMATION CARD 



CIRCLE KI6 ON FREE INFORMATION CARD 



60A48 



OCEAN STATE ELECTRONICS 

PROFESSIONAL, AMATEUR, OR COMMERCIAL — WERE YOUR ONE STOP ELECTRONIC SOURCE 
CALL OR WRITE FOR OUR FREE t12 PAGE CATALOG 1-401-596-3080 




DELUX CODE KEY 

AH^tCjit):*. *m*:<fy ^\Aj but bu* 



*10.75 



MASTERING THE MORSE CODE 

Th« &«*, imcAm Ih* biftMir hOM « LH/n [h» Mori! 
CxOm SanVOltCpaOMWMan^LJlHhirpncJEng 
irv* W91.B Coda. lAvccCW ak^fuCsCiymio ind md 
tmcMttt cod*. rKMr la buiU and hoiA uft i etui* pncAot 

^.50 



CODE PRACTICE 

OSCILLATOR & MONfTOfl IN KIT 

FORM OR WIRED 



lp««>Ar. h«Kphoi^ Utnnntlt, 4 Kfumt coHtc^ and l 

cotorp»nfJ WlltthvKWiorTQratnv 

^' parU Jhi (im csn «aa^ ^ CO'tVlad 

Mto CW rrerHar K cvi Uw* lor* 0* 

«i1 „ $19.»5 

Wir«f _ «4.»5 




LINEAR [C'5 



NtSM 

UA7WS 
UAJSl! 
UA7S2Q 
LIA7S^ 
LIA7512 
LM3T7T 



.25 
1.R 
.M 
JO 
,»« 

.4« 
.4« 
.71 



TRANSISTORS 



PK2i22A 
2mOS5 

2NU« 

2H44Q] 
MPF102 



.07 
.33 

.SI 
2.75 

.31 
1.M 

.10 
.10 

.IS 

.a 



ran^ MAONETWIRE 

»14, 3.iS •S4 3.T0 «i . .4.80 

lie 3.3(1 126 3.7S CSS .4.M 

l^e 3.35 128 3.U >3S 4.99 

tm .3.9$ MC 4.M flO S.ia 

f22 . 3.IIS ^i: 4.40 



rOROIDS 



IRON 

T-JS.l 40 

T-2S-S 40 

T-a7-S ._ 4B 

TJ7-12 45 

T-BO-I 55 

T-50.3 55 

TBO-e S5 

T8B-0 7S 

T6S-2 75 

T6S-8... 75 

T50-2 85 

T200-2.. 4.00 



FERRITE 

Fra7-43 ao 

Frj7-«1 SO 

FT17-7T eo 

FT50-43 „...7B 

FT60-SI 75 

FTW-77 -75 

FTS2-43 _1.00 

FTKl-Sr 1.00 

Fr»2-flS 1.00 

FT114<1 2.15 

FT140-43 4.10 

FT240<1 e.OO 



WE STOCK A COMPLETE UNE OF 
TOROIDS AND BEADS. 



Q-DOPE 

iaM and '^a.vm i tioas, pnXwOiM amf\i On 



^^ <»T» miA at pqfrilyrwi* 

iBwiB wi\h Brusn zn &t 59 mq. $3.75 



CD22402E 

CMOS LSr^jK 0«n*f«« 

$9.95 



^i^ 



MAKE CIRCUIT BOARDS 

THE NEW, EASV WAY WITH 

TEC-200 FILM 

JUST 3 EASV STEPS 

coTEOJOOHm 

wing w P>H> 




I4l1;2j(11ltf* 
n CorrfM* irfltnicuni 
S SHEETS... 

m SHEETS 
2C SHEETS 



. .M.2: 
»10,7S 



REGULATED POWER SUPPLIES 
13.» VDO 

«r>«r 13 a VDC c»n« LEDnnwdcaK'. ifidflcrcuf 






SAMP t29.B0 

4 AMP »3e.io 

SAMP .|4e.so 

1DAMP . »7«.B0 
2D AMP tllS.SO 
30 AMP 1148.50 



T^flf 



MINLCIRCUITS SBL-1 
OK>DE RING MtXER 

LG'Fif 1-50CMHr 
$«.T5 



MINIATURE TOGGLE SWrTCHES 
3A 125V SoldcF TsriTiiniis 



SPOT 

Dpor 



ONGW 



S1.25 
$1.50 



V ft 




DIGITAL CAPACrTANCE/ 
INDUCTANCE METER 

DiOJTM. LCR METER nvnurw 
induetino*. ctpKitne* im iviUNKfl 

■rod Noiryavcin nnM»ur*wAt. 
ETKnlknrwt . CAskH trvn 1 ^ to 20CH 
CapaoKXi trOnn 1 pfd U ?X' Jrtfd ind 
[Matoi rn<Ti 1 tihM n 20 iTMO Ohrrm 
Al VI on* hantvld MiruiTvrX 
I40D€LLCR-1M1 1119.95 




VERNIER DIALS 

1 - Mr CmMtmt 0- EC Uuhng ¥Sj25 

1-1>2-D>«m«tvOIQ0H«rK^ $925 



Iffi 



SIGNETICS NEE02AN 
«i9«ifltw4v» tot b<.>i!^ DC tr< ttjfm-t-^ 



S2.Aa BUY 3 OR MOHE ...$2.2S 



200 WATT INVERTER 

Plug* <H\iC yOW <flhl«* 4.-^ fyr4. 




inpyl 



PWCKB 
IlivontAClnMniie 

200 fitmt For 2 [TMIUM 



QRP CW TRANSCEtVER KTT 

• Oowi u Mm » u 1 Uku vt 2D U «raQwu 7 UKt to 7, ISO UHi Ofi 40U 

■ Avii^ita m 20M or 40M thUtf 
» Suptrlor StfpvtMl 

• GJngkfgniLl rfcvlvtr 

• VFO ciawiflw* v*Traf fl* 

' RnriM*c«iMt(sit*ni«nii>oi I ^ 

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COMMUMCAIXIKS 

ACE Comtnunicatioos MoTHlor Divjsion 
10707 East 106th Street Fishecs. IN 46038 



Dial 317 849 8683 to get ins^nt tech infamation FREE from your Fax! 
Y<xi can obtain specs and info on these products and mote by dialing our Fax Facts 
automated service. CaO our numbef trom your ^, ttien request ti>e document as listed 
bielow. Start your fax and the document will $ta/t printing imme<Sately on yccr faxf 




Mobile Scanners I Hand Held Scanners 



1 





Scanner & Shortwave \ 



AGE ARIOOOXLT 

$429.00 

AM Broadoast to 

Microwave 

1000 Channels 

SOOKlIi to ISOOMHz coverage in a 
prognmmable hsnd held. Ten scan banks, ten 
searcti tiank^ Lockout on search and scan. AM 
plus narrow and broadcast FM. Priority, hold, 
delay and selectable seaicb uioenient of S to 995 
KHz. Permanent memofy. -4 AA ni-cn<to and 
wall plus dg diarger included along with belt 
clii), cas«, ant & earphone. Size: 6 7/S x 1 3/4 x 
2 1/2. m 12 oz. Pax fact document U 20S. 



AR2500 
$429.00 

2016 Channels 
1 to ISOOMHi 
Qnyi^Gr Cbntnd 



62 Scan Banks, IS Search Banks, 3S Clunnels 
per second Computer control for logging and 
spectrum display. AM, NFM, WFM, & BFO for 
CW/SSB. Priority bank, delay/hold and 
seiectable search increnvents. Permanent memory. 
DC or AC with adaptors. Mtng Bikt & Antenna 
included. Size: 2 t/4H x 5 5/8W x 6 i/2D. Wl 
lib. Fa)c&ct#30S 



AK3000 
$1096.00 
400 Channels 
100KHzto2036MHx 



Extreme covoage, excellent sensitivity, plus 
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in search. 4 priority channels. Detay & bold & 
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included. Size: 3 1/711 x J 275W x 7 7/8D. Wt 
2 lbs., lOoz. Fax fact document #t05. 

Free Stuff 

Dono disk of SCS (scanner 

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Bearcat 

760XLTM 

$249.95 

100 Channel 
800 MHz 

Five blanks of Id cfaanneii each. Coven 29-34, 
118-174. 406-512 and 806-954MHz (with cell 
lode). Features scan, search, delay, priority, 
memory tiackup, lockout, service search, & 
keylock. Includes A.CIOC oofds, mtng brkt, 
antenna. Size: 7 3/8x6 13/16 x 1 3/8. Wt: 
7,31bB. Fax fart document #350. 

Bearcat 

590XLTX 

$199.96 

100 Channel 
11 Band 

Five banks of 20 channels each. Covers 29-54, 
lis- 174, and 406-5 12MHz. Features scan, 
search, delay, priority, memory backup, lockout, 
service search, & keylodc Includes ACDC 
cords, mtng brkt, antenna. Sim: 7 3/8x6 13/16 x 
1 3/8. Wt; 7.51bs. Fax fact document #370. 

Bearcat 

560XLTZ 

$99.96 

16 Channel 
10 Band 

Compact, digital programmable unit covers 29- 
54, 136-174, and 406-5 12MHz. Features saui, 
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iodcout, revicw,& auto delay. Includes AODC 
cords, mtng tirkt, antenna. Size: 73/3x6 15/16 x 
1 5/g. Wt:2,3ite. Fax fact docunwnl #560, 

Trident 

TR-2C 
$89.95 

Soan/CB with optional radar detector 

Scans prc-progranuned by stale channels in low, 
high, UHF & T l^nds. Weatbo-, 40 cfa. CB 
receive plus mobUe relay. Size: 7 3/8x6 15/16 x 
1 5/8. Wt: 2.51bs. Fax fad document #580. 




Q 


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AOR 900 $199.95 

100 Channel 800 MHz 

Five scan t>anks 5 search 
banks. Covers 29-34, 118- 
174. 406-512 and 830-950 
MHz {no cell lock). Features scan, search, delay, 
priority, memory backup, lockout, service seaicti, 
& keylodc Includes AC/DC COTds, mtng brief, 
antama. Size: 7 3/8x6 15/16 x 1 5/8. Wt: 
7.51bs. Fax fart document #630. 

Bearcat 200XLTN 
$239.95 200ChannEis800MHz 
[vEj'board Progranunable. 

Ten scan banks plus seaidi. Covers 

29-34, 1 1 8-1 74. 406-512 and 806 

956MHz (with cell lock). Features 

scan, seaidi, delay, 10 priorities, 

mem ttackup, lockout, WX scarcli, & 

keylodc Includes NtCad & Chrgr. Size: 13/8x2 

11/16x71/2. Wt32oz. Fax Facts #430 

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$239.95 

12 bands and 40 channcis with SOOMlIz and 
nothing cut ouL AC or DC. Fax fads #690. 




2 Way Radios | 



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I 

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ACE Coiranunlcations 10707 East 106th Street, Fishers, IN 46038 

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Ball and socket typesnli 
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12 parr per package. 

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^ 



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$1«° 



Pet Pkg 



Tripiett DMM 



TtvB TnplBtt model 2202 d^ital inuttimetaf is a tull 
tunctian DMM with buitMn transistor and battery testers 
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manual, and carrying case included. 



#RJ-390-140 





^^^fs^ 



PylelS" Poly Woofer 

1 5' poly wooter 

with a 60 01 / 

magnet and 2" y 

voce coil. Mineral- ' 

filled poly cone 

with poly loann 

surround Poly 

cone provides 

proper internal 

damping to help control cone motion at 

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VAS. t0,9 CO ft . QTS. 53. Is. 30 Hz, 

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Net weight; 9-1(2 lbs 

#RJ-292-070 



$641°,, 



Picltering Headphones 

We made a special 

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rdynamio high 

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ferrite magnel. Adjustable headband 

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#RJ-249-1M 



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Each 



10", Thruster Car Woofer 

Heavy duty car woofer capable of handling 1 7S watts 
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OTS" .26. Frequency response: 30-2,000 Hz. 
Magnet weight; 38 Of, 2' voice coll, SPU 92 dB 
tW/lM Net weight: 6 IBs, 




#RJ-293-0g0 



$29^5 



Each 




Honeycomb Tweeter 

unique tweeter 

with a square 

diaphragm ol 

honeycomb 

material 

Diaphragm is 1" 

square. Excellent disperskm. IS'ie' 

uoica coll- Frequency response; 2,000- 

20.000 Hj. Impedance: 9 ohm Power 

handling . 25 watts RMS. 40 watts 

maximum, 4" K 3-1/4". Umited 

availabUiiy, Net weight: 1 lb. 



#RJ-279-110 



$8^° 



Each 



Fluorescent Work Light 



High Voltage Cap Kit 



This 85 piece kit contains a selsciion of 250. 
350, and 450 vol! electrolytic capacitors,- 5 
pieces each of 1.2-2, 3.3. 4.7, 6.8. 10, 22uf 
and 2 pieces each ol 33, and -47uf. 250V 
radial caps. 5 pieces each o( 1 , 2,2, 3 3. 4.7, 
I0uf and 2 pieces each of 22, 33ul, 350V 
radial caps- 5 pieces each of 1 , 2,2. 4.7u( 
and 2 pieces of 1 0ut, 450V radial caps 
Over £62.00 wtiolesale cost if pufchased 
individually. Net weight: 1 lb. 

$49|L 



#RJ^20^9SO 



3*' X 5" Speaker 

Standard radio 
and TV speaker. 
16 ohm impedance. 
3 watts masimum 
power handling. 
Limited availability. 

#RJ-299-115 



$1^S 



Each 



Large Input Terminal 

Large tnpul cup with push 
spring terminals and 4 lug 
terminal sirip on rear. Flush 
mounted housing measures: 
4' X 5-V.''2' outside diameter. 
4-5,''8" X 3-1.'16^ mounting hole 
i]QC[uirfid. Limrted availability. 

#F?J-26g-220 



Pyle 10" Poly Woofer 

Long throw poly woofer wijh 
poty (oam surround for ^ ^^^r'*^ '. 

superb low bass, Mineral L ^^^^ ^fi 

fiJIed pofy cone assures loW ^ ^||j^ ' 
frequency sound that (S ' - . . . _^ 

smoolh, tighi, and low in "^^km^^ 

distortion. 2"voicecotl, ■'^m^r,- 

power handling: 85 watts 
RMS, 130 watts maj<. (s-43Hi, Frequency 
r&sponse: 25 3.000 Hz. SPL- 95 dB IW'IM 
Impedancft. 4 ohm 40 or magnet VAS«t 8 
CU tt., OTS- .34, QMS- 10.92, QES- 35 
N«twenht: Bibs. 

$4511, 



^^Each 



Deluxe In-Wall Speakers 

PertecE surround speakers. Customize your 

medra room with Ihese super quality, in -wall 

speaker pairs. Full size 6^1 ^2" woofer Heavy 

duty 1 ' sofi dome tweeter Built-in crossover 

Fits any standard 2 x 4 or larger wall Retroiil 

destgn allows easy installation Jn new or existing 

walls. Response: 50-20^000 Hz. 8 ohm impedance. 40 watts RMS. €0 

watts maximum. Includes provision for easy 70V.'25V transformer mounting 

Overall dimensions: fl-lj'2'x12'. Net weight: 9fbs. 

#RJ.300.O36 $299** $99^pi 




Handy tlflht operates on 120VAC or 12VDC. 
Puts light whara you need it. Extra bright 
1 5 waft tube, 1 5 loot oil resislani powoi 
cord wtih wall adaptor and cigarette lighter 
plug. Two tiooks provided (or hanging. 
Net weight: 2 lbs. 

$10Eacti 



#BJ-360-490 



5-1/4", 2-Way Pioneer 

5-1/4' paper cone 

woofer wrlh & 1 * 

post mounted 

polymer twMter. 

4 ohm impedanc^r. 

Response: 100- 

20.000 Hz. Power 

handEIng 35 watts 

RMS, 50 watts maximum. 2-3^4" 

mounting depth. Limited avalJabillty, 

Net weight: 2 1/2 lbs. 

«BJ-269-0e5 




$-1280 



Each 



Mini Super Tweeter 

Super paper cone 
tweeter wiih silver mylar 
dust cap. Iiiipe<lance: 
8 ohm. Power handling 
capability: 2 watts 
RMS 9-1 '16- voice 
coil 1 -1 ffl' diameter 
cone with mourrting 
tabs. Mounting holes' 
1 -7/8' on center. 
Limited availability, 

#RJ-279-120 




95" 



Duracell "J" Battery 



f*opitFar TV.'stereo 
remote control 
battery Size "J',, 
S volt aikaline. 
Duraceil #7K67 

#RJ-1 40-090 




$3"° 



Each 



I 



15" Thruster 

Super doty. 1 5' car audio _ 

bass driver Low 25 Hi^ " 

resonant frequency 

Weather resistant 

polymerized paper cone^ 

with red poly foam 

sunound and two color 

printed dust cap. Power handling capability 

IS 250 watts (170 watts RMS). 2" high tamp 

voice coil wi[^ rear vented pole piece. 4 

ohm impedance. 50 oz, magnet. Frequency 

response; 23-2,000 Hi, VAS. 19.04, QMS. 

3.9S, QES. .21 , QTS. .20, SPL. 97 85 dB 

1W/1M. Net weight: 11 lbs 




#RJ-293-150 



$59^^ 



Each 



#RJ-292-030 



The Loudspeaker Design 
Cookbook IV 

This book descnbes the "science" of 
toudspeaJcer design, however applying it \s 
an "art' Using the informatFon m this book 
will yield hundreds of possible vanations in 
spe^er design, with some sublie and riot-so^ 
subtle differences, 19S1 copyright, fourth 
edition Author- Vance Dickason. 
1 54 pages paperback. 

#RJ-'500-035 



$29^^ 



Each 



Right Angle 
1/4" PInone Plug 
(Mono) 



a.^ 



#RJ-099-020 



PARTS EXPRESS 
340 EAST FIRST ST. 
DAYTON, OHIO 45402 
LOCAL: 51 3-222-0173 

FAX: 513-222-4644 



'^'*'Eacb 



Cabinet Carpet 

This high quality carpet oonlorms easily to 
shai*p corners t>ecause It ha^ no stitf baching 
You can also sifetch it to cover irregular 
shapes. This is the covering ol choice tor 
car, stages, and amplifier cabinets. Carpet Is 
strong yet easy to cut with knife or scissors 
Adhere with spray adhesive or tatex contact 
cements. Provides protection and good 
loof^s Sold by the linear yard. 54' wide 

#RJ-260-76S (Dark Charcoal) 
#RJ-260-767 (Medluin Qrey) 
#RJ-260-768 (Jet Black} 




Per Linear YanJ 36* x 54" 



■ 3C day money back guarantee ■ S20.00 miniiruin order ■ We accept Mastetcard. Visa. Discover, and company 
C. 0. D. orders. • 24 hour shipping • Shipping charge = UPS chart rate + $1 ,00 ($3.50 minimtjm charge) • 
Hours 8:30 am - 7:00 prr EST, Monday - Friday • 9;00 am - 5:00 pm Saturday. Mail order customers, please 
call tor shipping estimate on orders exceeding 5 hs. • Foreign destination customers please send $5.00 U.S. 
ftjnds tor catalog postage ■ 



60A52 



CIRCLE 2i2 ON FREE INFORMATION CARD 



Parts 




*ower Cord 

■vp0f duty power cord. 
A ga^> 3 conductor. 

ft. tenath. Limtted 
vailability. Slack color. 

lRJ-1 19-010 




$150 



Each 



12VDC, 800mA Adaptor 

Fisher Price battery 
ctiarser. IJOVACn 
1ZV0C. 96W(»XimA) 
output. E It. cord with 
special connector 
Limrted avallabilrty 

#RJ-1 20-361 



nA Adaptor 

input, ^^p 
imA) ^^ 



VCR Parts Assortment 



convenient assortrnen- 

M dips, washers. 

Springs, and screws. 

10 pieces eachoM 

Biies of 'E'ciips, 10 

pieces of 2 sizes ol 

rdalntng rings, 10 pieces ot 14 sizes of 

washers, 2 each of 8 sizes ol tension and 

OOiripressfan springs and 24 assarted 

screws. Total of 246 pieces. 






#RJ-430-31S 



$6^^ 



Eacli 



Speaker Sealing Caulk 

Special mbber 

compound qytckiy 

and easily sea^s 

speakers into cabinet 

Eliminates vibratiori 

and air laaKs. Sokt 

in 1/4- X 36" strips, 

Strips are selfadheaive so they stick 

easily to speaker freme. Limited quantity 

#RJ-26M00 75|^^h 




Replacement Antenna 



Hinged 7 section antenna. 1 9' extended. 
S-IM" collapsed. 3/1 S" threaded base. 
Excellent antenna for portable radtos. 
TVs, arid more. 

#RJ-210-200 



50? 



Each 



Quality 30 Watt Iron 



Econormioal 30 watt iron with replaceable 
lip. Blue plastic handle. 1 20VAC. A 
quality iron at a reasonable prtce. 
Display packaged . tfi ji on 

#ftJ-37(M)10 iP^Eaeh 



Soldering Starv 

Cofivenisnt weiahtad 
soldering iron stand 
with cleaning sponge 
Oispla^ t)oxed. 

#RJ-37(W)20 $4e^,. 



Kester Pocket Pack 



Perfect tool box solder supply, The 
wire feeds conveniently ffom Ihe 
h andy dispenser tu be . Pocket cl ip 
attached. .031" diameter solder. 
■5 ounce {appnoximatety 15 feet}. 

00 

Each 



#RJ-370-050 



* I 1 



PARTS EXPRESS 
340 EAST FIRST ST. 
DAYTON, OHIO 45402 
LOCAL: 513-222-0173 

FAX: 51 3-222-4644 



Isotip Butane 
Soldering Iron 

The ideal soldenng iron 
lof field repairs where no 
AC power is present 
J for up to 1 00 
of continuous 
ipafrflfill. Uses 



IndiKtedJ availal^e at 

mcst stores. Tip 

lemperaturs is adjustable | 

up to 1067' F. Iron also 

conws wtth a torch attachment whicfi 

easily screws on in place of the soldering 

tip. As a torch, one refill will provide up to 

1 hour of continuous flame. Temperature 

is adjustable up to 2372° F A protectjve 

cap with a built-in striker Is Included 

Limited one year wan^anty . 

#RJ-370-235 $24|fch 




Cable Tie Mounts 



Package of 10 
adhesive t>ack cable Ei i; 

lie mounts for securing 
bundtes of Wire. 

#RJ-080-515 



$120 



Pkg 



Monitor Power Jack 



standard computer 
type monitor jack. 
Limited quantity. 

#RJ-090-446 



Spray Handle 



Fits most paint 
and cleajier cans. 
Limited a«ailability 

#RJ-340-371 



^ 



• ** Each 



Pull-Out Radio Carry Case 

Super quality nylon bag 
for storing pull-out radios! 
Padded construction wtth| 
adjustable carry strap. 
Storage pocket will 
hold up to 5 CD esses. 
Inside dimensions: 
7-1,2' K 2-112' X 8". 

#RJ-265-950 



F-59 Deluxe Connector 

Popular connector for 
cable TV systems. Full 
attached ferrule lor hex 
crimp. Securefy hoWs 
Re-59 cable 



#RJ-090-355 



17* 

* ' (50- up) 




Matching Transtormer 



Adapts 7S ohm coju to 300 ohm twiri 
lead (or vics-versa) at antenna or 
television. 5-90 MHi UHF/VHF. 
capacitor, PC board type. 

49* 



lJ-1 80-010 



Each 



TNG Male CrImp-On 

r. 



(ForRQ-SS 
and RG-62) 



#RJ-090.1000 $1*^ 



Each 



8 Position Dip Switch 



Switch type (IE: 
reciter, slide, toggle) 
may vary. call. 

#RJ-0€0-134 




Technician's Turntable 



60L, 




Turntable to speed repair of VCRs. TVs 
and more, Lets technJcian easily turn 
unri For convenient repair. 20" diameter. 
White osbr. Netweifltit: 5 lbs. 






#RJ^360-425 $19lLh 


Outdoor Phone Jack 


Heavy duty, 
drecast abmlnum 


housing 

withslands iha ^ 


harsh conditions V ' , ,^ -«■[ 


associated with |||^^j^^^^ 


outdoor use. ^^^^^r 


Form gaskel ^^ 
under snap shut lid prevents water 
leakage. Complete with mounting 
screws. Limrted evaLlabllily. 


#RJ-1 50-030 $2^3^^ 



12V,2.3AH 
Camcorder Battery 

Popular tiattary for use 

with Canon. Chinon. 

Curtis Mathes, G.E., 

^agnavox, Minolta. 

Olympus. Panasonic. 

J.C. Penny, Pentax, 

Phlico, Quasar, Sears, 

Sylvanta. Teknika and 

other miscellanaous manufacturers. 

Dimensions: 7.tr (L) i .94- (W) X 2.42" (H). 

WeigM; 1-1/2 lb. 

#RJ-1 40-541 




$41^5 



Each 



Velcro Type Fasteners 

2, 1 ■ X 2" tiook and loop 
fasteners for attach Ing 
almost anything. Great lor 
securing radar detectors lo 
your dash. Each piece has 
a self adhesive back 
Thousartds of uses. 




#RJ-2&5-900 



48« 



Universal Video Cable 




6 ft. RG-59 cable wr^ a push-on *P 
connectoj- to a combination 75 and 
300 ohm balun (switch able 
between 75 and 300 ohm). 

#RJ-180-126 




$21! 



Each 



AGC Fuses 



San-0 brand fuses. Sokl in boxes 
ol 1 00 pieces Special buyout price. 
Limited availability and values. 



#BJ.070-421 (.SA) 
#BJ-070-429(2.5A) 



Per 100 



Pkg 



Pressfit Speaker Terminal 



spring loaded, 
pushbutton speaker 
(enrtinalin a j'ound 
housing. No screws 
required to fasten; 
simply drill a hole, 
apply glue, and 
press Into place. 



#RJ-260-295 




^^Each 



3,5 Amp DC Power Supply 




Mini Headphone Extension a quai^y, compacr i2vdc pov^er supply 

Perfect for testing car stereos. CB equipment, 
radar detectors and other 12V0C ttems. 
Regulated 13.3VDC. 3.5 amp continuous, 
S amp surge. LED power Indicator. Binding 

'post outputs. Net weight: 4 lbs. 



Add 6 feet to your mini 
headphones. Gives the 
user added mobility wheri_ 
listening lo personal 
cassette players. 

#RJ-240-090 




$1 



65 

Each 



#RJ-1 20-500 



$231^., 



Unfinished 6" x 9" Cabinets 

You can paint or finish to your jiking. Deep 
enough for extra large magnet speakers. Flush 
mount design for rear deck bafTe appficatkons. 
Dimensions^ 11-3/4" x B-MT x S-3'4'* x 5" (tapered 
back). Sold in pairs. Net weight! 9 lbs. per pair. 

#RJ-260-450 $1 2^aj 


1 
> 

# 


y 



Belt Camcorder Battery Pack 



Very high current power pack. Will run 
most camcorders up to 10 times k>nger 
than dtp- on batteries. 12V. 6.5AH se^ed 
lead acid type battery . Fuse protected 
with cigarette lighter output. Comas in 
padded case with quidt release bed and 
Li L approved chargef. Net weight: 6 lbs. 

#RJ-140-6O3 




CALL TOLL FREE 

1-800-338-0531 




'4 



FREE CATALOG 



% 

I 

SP 

a 

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CIRCLE 262 ON FREE INFORHIATION CARD 



60A53 



QiCAD 



• " * •••• »" 



** * • 




gav 



Use professional-quality PCB 
design software to save 
t\meand money! 

QiCAD is a full-featured printed cir- 
cuit layout pactoge ttiat gives you 
everything you need to design circuit 
boards quickly. 

• AUTOROUTER 

• POWERFUL EDITING 

• HPGUDMPL PLOTS 

• GEHBER 

• POSTSCRIPT 

• EXCELLON {DRILL) 

• ENGRAVED PROTOTYPES 

• EGA / VGA compatibile 



' $195.00 complete 

J FREE working student versio 



! price 

t version I 

2161 W. Williams Ave. Suite 281 

Fallon, NV 89406 

(702) 423-1 601 (408)459-0903 B BS 



MS-DOS EPROM 

PROGRAMMING SYSTEM 
NEEDS NO INTERNAL CARD 



ErWMl l2A.Uutl 12 pllBl 
:TO),2T5g, T\!S271S-. 2TI» 
27C16, JJlb, 2532*, 25M* 
*K764*, W76*", 2T3i, 27,12 A 
27t:j2. 27M, 27«4A, 27f;iS4 
27I28,27USA.27C12« 
27256, 27t.2S«, 27512 
27CS12, 27513', 27C0L1" 
27CI310, 27CI001 (1 MK(;> 
27C020, 2712001 (2 MK(;) 
27CW0,27C4<»I (4 MtfJt 
ifris KFKims •!. J * 4 k>t:r , 
nV 102.1. 27C2«4». 27C40W 
27C210, 27f220, 27C240 




21(04, 2111M, 2«C16.2«I7A* 
:»M,i, 2>SV64, 2825*, 2JC25* 
«30»>/?.l(06, ».M(i/9JC46 
9^S6IV.KM, 9366/».lCM 

1)741 A, (4742, S74S(il),K74»(H> 
8751/C-5I.S7S2/L-S2.S7S3 
8744. «7LSX.\. TMS7742 
«S705(2«44Ophi>.MHC7tW 

«J.S23/123,74SI88/28»^2»7/J«7 
•ADAFIER ftEQUinm 
DixicFvmi includM v,ith rnuiuL 
.^irm bird BCMptcn in; ■valIudI? 



PARALLEL 



PRINTER PORT 



* f l-iT. EAHl .Il}-r>il: ■iV^TlM WfiRKS (Mill IS^ Dt-VKTOl- OR LAPICIP MaCHIM 
J \nMtABLt UKlilCN SlTPtJRTS OS t.K 500 (HIPS FMS ADAITS lO SfSS' DFVl* tS 

51 mint!, s, 16 s ,12 Brr data KJRMITS IM I I Ul^u woed spi it 1 noi BLE WORD 
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■HAKDWARl :pEIllK(Tt:i)A(.AlNM DfJK 1H1 iM> l\r (IRRH 11 1 IVS* (sn IJ DtVICES 
.APPKOVI-DPROt^RAMMIM.; AK.OlliraM!, Mil-. I lit V H Lb PKOI.RAM 1\ I.M1FR 1 !HIN. 



SYSTEM SOFTWARE COMMANDS 



.pro(;ra,v( devkeis 

rtOM DISK FILE 
•READ DISK FILE INTO 

BlTFtR 
■READ DEVltElS) LVTO 

BLITER 



•SAVE DEMCEISI OR 
B1JFF"ER TO Bisk 

•PRtMiRA-M OEVICEfS 
reOM BCITTR 

■CO.MPARE DKMtEtSI 
wnil Blll-tH 



^01^ DtVICElS) 
•VEKIFS DEVICE ERASFl) 
^ELLCI Bl IfES UHTdK 
•SELJlL t DIA U K TV PE 
•BEVKEfHECKSlM 
-SELECT BVFFER 



I PLVSAS INTEGRA TED BUFF E K KDITOK WITH IS BYTE IJ iVEL C OMMAfiDS 

$289 



SVSTE.M rNfl.l DtS: PROG (LAMM INC 1 NIT, PO^VER PACK 
CONNECTINC CABI.i:, OPKRATiON MAM Al & SOmWRK 



VISA 



\Eo J5.M yovL siiiPTINt: 



TO ORDER SEND CHECK. .MONKV ORDER. WRITE OR CALL: 

ANDRATECH 

P.O. BOX 222 

MILFORD, OHIO 45150 

(515)831-9708 

lAX l5IJ)S?l-75tl 



AOD to* fOft t\U.{}. 

WRITE PR (.AU. FOR MORE INFOILMATION OR A DATA SHEET 



XANDI Electronics 



h. k.A 



SATISFACTION 
GUARANTEED! 




Th* UM of Mir- 

fRcs mount 

tach n ology 

makes tills th« 

smallest FM 

trsnamitlaryou 

can buy I Tills is 

not a toy, it out 

performs mod 

units on the maifcet today. Our E-Z-ldt 

has aN ttia turtsce mount parts pm- 

a w sm bted to the circ uH txM rd. 

XST500(E-Z) E-2 KB $39.95 



@ ^ 



Ths Lisa erf sur- 

laca maunt 

tacti n ology 

makas IKIs th* 

a m a I I a s t 

t al a p h o na 

transmttteryou 

can buy. ^wered by the phone 

Una, ft can IransmHa phone con- 

vsisatkxiupto1/4mtte. OurE-Zkh 

hasalllhaaurfaca mountpartspra- 

iiiem btedtothecircuH board. 

..$29. as 




X3K50(E-2)E-ZKtt. 



The XTR100 Tracking TranamlttW 
transmits a continuoualy beeping 
tone that c«n be racaivadby any FM 
ncahfar. Ca n be u sod for gam ««,con- 
taatSj or as an anti'^han davk^, 
XTR1 00(C) Kft $ 39.95 



m 



^ 



The XFM100 FM transmitter has a 
range of upto1 milai Itworfcawilhany 
standard FM receiver, tt contains a 
built In high gain two stage audio 
amptifiarfor maidmumsantnh/lty. 
XFM1 00(C) Kit.. $35.95 



Z 
c 

2 




^1^ 



ThaXTTIOOIsa battery powsred 
phonatransm itterwith a range of uplo 
one mile, ft only transmKa whan llta 
phone is being uaad In order to con- 
•erve battery liMu 
Xm 00(C) KH $3S.»S 



The XBO20O quickly locatea hidden 
transinittersfrQm 1 to 2000 MHz by 
aniitting an audio output proportional 
to the trsnam It lavaL 
XBD200(C1Kh S44.9S 





LtsatheXPSI 00 to call you rhom a from 
any other pfion a a nd listen in usin g Ih e 
builtln mlcrophona and amplifiar. 
XPS1 00(0 KH „.... $ 45.95 



The XPB1 is a telephone Iransmlttar 
capable of transmitting to any FM 
receiver up to a 1M mile away. 
Powered by the telephone line It re- 
quires no batt sties, 
XPB1 {CI Itit $29,95 



WE ACCEPT VISA, MC, CK, MO 

ortn oi CTACC Ann (t<^ riA 



CALL 1-602-829-8152 OR 
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1-800-336'7389 



MAIL ORDERS TO: 



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TEMPE, AZ 85285-5647 



60A54 



CIRCLE ZS1 ON FFlEE INFORMATION CARD 



RAINBOW KITS I LASER KITS 




RADAR SiG]^AL 
DETECTOR 

If you Ihink that a sen- 
»ltlvs radar dot»ctor i« a 
cornpHcated piecfl oi 
equipment, take a looK at 
tht9 new kit. TNs simpte, 
yat effective, dot»ctor 
circuit can ba ttuMt in 
less than an hour and 
can o« ttjned \o respond 
to signals betwean 
50MH2 to &OOGH1. It a a 
tun kit to tiuitd and play 
with. A ciQarelta lighter 
piLjgi Is knoludad. Size 
VxW aperatfls on 9 to 
iSvOC, 
KITRSD'1 $1Z95 



SntOBEUGHT 

U you need an attention 
geltsr, or wamirig light, 
you nead the strobe light 
kit. Use It for ernergoncy 
light tof autos, for model 
planes or radio towers. 
Even usa it on youf bicy- 
cle. Operates on 6 or 12v 
DC and has a variable 
strotM rate. 

K(TST-1 $8.95 



DiGrrAL TUEItMQMrmt 

Have yoLi ever wanted to 
tell temperature changes 
fast 4 accurately? The 
DT-1 kit will turn your 
digital volt meter into an 
accurate digital tt^ermo- 
meter with .1 degree res- 
□tutior^. It Qwes you a 250 
decree window with a 
range from •40F to 300F 
degrees. I| has a remote 
sensor -25" sq. chat can 
be moiuTitsd many feet fjTxn 
the meter if need be, 

KIT DT-1 $8.95 




BUKUYUGHTS 

Want to attract atten- 
tion? These kits »t6 
perlect lor de-corattng 
name tags, lighting up 
your hat, or flashing 
light* for your modaE 
trains. Some [>eopie uae 
them to simulate a burg- 
lar alarm lof autos, Pul it 
in A boXn set it on your 
dash and H looks like the 
real thing. Each kit con- 
tain? iwo LEDs that alter- 
nates flashing. Op>eratea 
on a 9v battei^. Size 

KITRB2 $3.45 



CAf ACrTANCE Mrmi 

This easy to build Kit will 
turn your digital volt 
meter Into a CAPACITOR 
METER. Turn that junk 
box of unmarkftd capaci- 
tors into a fortune. Meas- 
ures capacitors from 
(2pF to Z2LtF. Operates 
on a 9v battery. Size 
1.75' x2' 

KITCA~2 S12.95 



WIRELESS FM MIKE 

Small r?wt mtgfity .8"x1" 
F>CB. will really stomp 
out a signal waM over 4Q0 
yds~ This is a buffered 
wireless mike that opar^ 
ates on SO to t20 MH^ 
FM. Comes complete 
with a microbhone. ^nd 
9V battery connector. 
Opatates on 6 to t2v DC 

KITWM-1 $12.95 




SUPER SNOOPERttG EAR 

Use this BIG EAR ompU- 
her to listen through 
walls, hear conversa- 
tions across the room. 
Beaf up the sensitivity 
with a parabolic reflector 
and hear blocks away. 
Que to the size, the BIG 
EAR can behldden about 
anywhere. Use tha ear- 
phones from a pocket 
transistor radio to listen. 
Makes an uHra-sensitlva 
Intercom. Gen aJso t>e 
used as a general pur- 
pose 1.5W amp. We sup 
ply a mini-microphone In 
the kit. Vou can also use 
ajiy 8 to 45 ohm speaker. 
Operates on E to 12v DC. 
Size 1"x1.75" 
KITAA*1 $10.95 





AC Uni MONITO£ 

This is something every 
computer user, photog- 
rapher, or anyone that 
must maintain a safe 
usable AC line voltage 
should have handy. Mon- 
itor the voltage of your 
motor home's ll&v AC 
generator Inside JIhe 
motor home. Every tech- 
nician's bench needs 
this item. The AC line 
monitor will indicate, 
with multi-color LEOs, 
what voltage rs being 
distributed to your 
equipment at that par- 
ticular outlet. 

KULM^IIO $10.95 




12V BATTEIV MONITOK 

Have you ever tMen In 
youf car, boat, or camper 
— you try to start your 
motor but the battery is 
dead? The BATTERY 
MONITOR kit us«s the 
cigarette lighter plug 
outlet to monitor the true 
t>attery voltage. Multi- 
color LEDs indicate tha 
voltage in 1v steps from 
1W to 15v, green means 
great, yellow Is good, 
and r^ — call the tow 
truck or get out the oars- 
Slie 12"x1.75" 

KITLM'12 $5.95 




PHONE UVG 

Small but mighty, so 
SmalF It fits anywhere. 
Telephone line powered, 
never needs batteries. 
Transmits both sides of 
a pnone conversation 
loud and clear, wireless, 
to any FM radio at great 
distances away. Variable 
tunes 70MHz to 130MHz. 
It can also be used to 
make any phone a speak; 
er phone. Stite .SS'xrv 
KITTEL-^BI $10.95 



mom RECORDING 

swrrcH 

This telephone lina 
powered switch Is small 
enough to install any^ 
where only .9"x.6". Every 
time someone picks up 
the phone the tape 
recorder will record both 
sides of the conversa- 
tion automatically. Use it 
In your otflce to record 
all phone conversations 
soycudon'l Jose that Im- 
portant address you 
wrote on the baok of an 
envelope. 

KtTTEL-SWI $10.95 



BUSV FHOKE UGUT 

Add this little kH to any 
or all of your phones. 
When any extensions are 
In use Ihe LED will liatit. 
Uses a 9v battery. P.C. 
Board 1"itrt" Complete 
with etctied & drilled 
PCB, all parts and sctie- 
mat I OS. 

KIT TEL-LIT-1 $9.95 




VOICE ACHVAIED 
SWITCH 

This vox oan be used to 
operate a tape recorder, 
ham radio, CB radio. Use 
it 10 turn on an alarm. 
Ttte output can operate a 
load up to lOOma. It will 
operate a relay, liflhts. 
motor, or LEDs. What 
oould you do with a 
sound aclivlated switch? 
Size 1.5"i(1.25- 

KIT VOX-1 $6.95 



La.5cr Switching Power Supply Kit, input 12V DC .75-1, 25A, Output 2 to 3 KV 
at 1-4.5 MA, trigger voltage of approx. S-10 KV. Complete with 6.25!* »2,25" 
printed oircuii board, schematic and alt the parts. 

LPS-1 $59.95 

IMW Laser Tube, NEW Mini He-Nc I.125'' dia. ji 5.75" long, perfect for 
experimenters and laser projects. Works great with above power supply LPS-1 . 

LlMW-l $39.95 

Mirror and Motor Kit— This unique kit allows you to project Lissajous patterns 
on walls and ceiling. Change the pattern by changing the speed of the motors. 
Comes complete with 2 motors, front surface mirrors, motor brackets, rheostat 
control to control fll motor, and high power resistors to use on 12 motor. 

MM-2 $19.95 



• SPECIAL • 

Laser Power Supply Kit LSP-1 

IMW Laser Tube LlMW-I 

Mirror and Motor Kit MM-2 



ALL 3 FOR S99.95 



9V lOOMA rechargeable 
Ni-cad batteries. This 9V 
Ni-cad is truly a 9V not the 
standard '7,2V you're accus- 
tomed to. Use over and over. 



NEW 



. .$4.00ea. 
10/$29.9S 



9V battery charger bi. This kit is a musi 
when you buy 9V Ni-cads, charges 2 batteries 
at once. Use on I lOV AC or with a 12V DC 
cigarette lighter plug which is included. 
Comes complete with parts, PC, board, 
housing and schematic, 

CH-9V. ....$19.95 



ifkifitititirlriritlfitirlrlrkltirk ir * icklt ickitlfirilitiilt 



THIS MANUAL 
CONTAINS ALL 
SCHEMATICS , PARTS & 
P.C, BOARD LAYOUTS 
FOR ALL OF THE 
RAINBOW KITS. USE 
YOUR OWN PARTS TO 
CONSTRUCT ANY OF 
OUR KITS. 




KIT BOOK $14-. 95 



*5.0O OFF IF YOU 
BUY ANY KIT . 

TV NOTCH FILTERS 

OUR TV FILTERS ELIMINATE UNWANTED TV 
CHANNELS OR ANY INTERFERENCE THAT 
ALTERS BOTH THE SOUND AND VIDEO. 



Channeis available 2 thri/ 6 & 14 thru 22 
Specify a specific channel when ordering 



UEDEnXTOR 

Tnis kit can bt grsat fun 
at parties. Lie and an 
audits I a tons will chan^a, 
ths more you lie the 
more ths tons changas. 
Whan you lie your palrn^ 
& torehsad sweat. This 
kit altowa you to meas- 
ure thaas changes. Only 
a vary slight amount of 
change will cause the 
lone ro Increase in fre. 
quency. Opafates on 6 to 
12v DC Size 

KITLD-1 $9.95 



NOTE: An Tvf\)t*' K'ti ut ta\4 fa* nlfuiiiuji^ii futinnmt Ontf Vou muitcbidlA f>*rnii|' 
i4ni ftofn y«F^ t^cM Ubi* con^^AAr tHfio-r* ui'i^ irrfii itiltri on v«uf citi^t lytiMfl 



CHOtCE 

14 



95 

£ACH 



******•••*•*••**••****••*•*•••*** 

P]«Bse add suMlcianl posliga 
We will ftccdpt telephone orderi for V4u t Mittereanj 



To Order Call 
317-291-7262 



IMBMHfG^VD I 



lElECTROniC RflinBOUJ 



6254 LaPas Trail • Indianapolis, IN 46268 



I 

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60A55 




COMPONENTS 

\A/hether you order 1 part or 
all 39,504...R/IOUSER Stocks 

and-. can ship today M 

CALL... 
(800) 992-9943 

for your 

FREE 

C ATA LOO 



Man:»f I eld|^ TX 7606 3 ' 




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Sates & Stock thg Lbcattoris Nationwide 



CIRCLE 2M ON FREE INFORMATION CARD 



r 



I 



SIMPLEX REPEATER 

F»R-Sa SIHPLEX VOICE REPEATER WILL 
WORK AS A VEHICULAR REPEATER QB 
A STAND -ALDNE SIMPLEX REPEATD!. 
SIMPLY CONNECT THIS UNIT TO TOUft 
EXISTINQ ITOBILE RADIO OR BASE 
UNIT, GREAT FOR HILLTOP OR FIELD 
APPLICATIONS. 

DRAWS M.T StJnA DF CURRENT, 



149.00 



fOOEL PR-SO 



HDaiCUP IS SEHPLE 




' liY 



SBC88A 

caNTROLLER 

• 16 DUTPUTS 

• le [NPUTs 

e ANALOG INS 

• SERIAL [/□ 
1 ADDRESSABLE [NS 

• 7 ADDRESSABLE OUTS [SSpP 

• ON BOARD EPROM PROGRSHHEH ' 

• BASIC. C, OR FOURTH LANGUAGES 




W^.^ 



PAK RAT ELECTRDNICS 
P.D. BDX 690073 
HDUSTDN. TEXAS 
ZIP 77269 
ASK FDR FREE INFD 

(713-893-0313 ) 




HDURS:NDDN TD 6 ; 00 MDN-FRI 9:00-1:00 SAT 




DM3050 
METER 

MEASURES: 
•FREQUENCY 

•CAPACITftNCE 

•RESISTANCE 

• AMPS 

• HFE 
•VDLTS 
•CDNTINUITY 



59.00 



^„ _^^_, EVERYTHING 
DM-3050 ^^j^f^ 

THIS ONE DDES IT ALL FDR 
A SUPER LDV PRICE \ 



i STATPnUER 2S0 

FITS IN THE PAUH OF YTIUR 

HAND I 

190.00 ! 

■miH CIGARETTE LIGHTER ATTACHMENT 




SINE UAVE INVERTERS 



HGDEL 



vavzp. 



FRnVATT 850 



PRQtfATT 60Q.. 



TRACE aoia 



eOlZ VI TH STANOBY 



PRICE 



550 UATTS 



600 WATTS 



aOQO VATT 



a POD VATT 



iSOJUI 



500 00 



inasL. 



JJIUL 



CHARGE CONTROLLERS 



M-t6 16-AMP 



CURRENT 



16 AMP 



TERMS 

SHIPPING AND HANDLING COST VARY AS 
ro THE ITEM ¥DU ARE DROERINC. 
ALL EQUIPMENT WARRANT [ED FDR 90-DAYS. 
CERTIFIED CHECK, PERSONAL CHECK OH 
MONET ORDER. PERSONAL CHECKS WUi FOR 
1-WEEK BEFDRE SHIPMENT. 




GIANT 
SDLAR 
PANEL 

3/4 AMP 
14.4V 

12x36 IN. 

44.00 EA! 



CIRCLE 2fi1 OM FREE INFORMATION CARD 



60A56 



SP^ 



vox 



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A DIVISION OF MINC Engnmifiif & PreduOi. \ac 



B 



ORDER TOLL FRHE 

1-800-669-4406 

FAX ORDERS : (818) 912-9598 



OVM-58C w/ 1 Meg DRAM $89.95 

TTw DVM-S8C with Its variable length message capablllles can store up lo 
16 individual messages lor Imnwdiate playback to enhance most any 
electronic application or project. Use It to add real voice prompting or 
instructions at an aftordabte price. 




DIGITAL VOICE PRODUCTS 



DVR-12()M The OVR-120M is a complete digiul recotd/piaybjcls unli that 
Incorporate the DVM'SSC wkhin an ABS enclosure. Including all the 
necesiary componcnti reqoited for Immediate use. $T49.9S 

DVR-240 The OVR-240 li an entirely digilal, tingle channel, looping player, 
wiiich will continuously cycle the entife message without suffenng 
from the effects of tape wear and audio degradation. S249.9S 

DVM-5805 The DVM-580S digital voice module is capable of fecord/playbaclc of 
up to 5 messages from its 32 second DRAM memory. $49.95 

DVM'ZSCM A compact digltaE voice module designed for pfayt»ack of up to 32 
seconds of pre-/ecofded messages from a single EPROM IC, which 
must tie ptagrammed with our DVMP Programming Tool. $49,95 

DVMP The DVMP programming toot is a norvPC based system designed to 

t>e used with your existing EPROM programmer for the purpose of 
transferring voice data onto EPROM iCs that are used with the DVM- 
2804, $495.95 



FLUKE DMM Series 10 



V 

9 
'$ 






• AC & DC voltage measurements to 600V. 



FLUKE 10 



FLUKE 11 



FLUKE 12 



Ohms to 40 Meg & diode test. 
4000 count digital display. 
Auto & manual ranging. 
Fast continuity beeper- 
Reliable by design. 

FLUKE 11 
FLUKE 12 



FLUKE 10 



$69.95 
$79.95 
$89.95 



We stock a Full Line of X-l Accessories 

• Lamp Modules • Appliance Modules 

• Floodlight Control • Receptacle Module 
Remote Sirens • Mini Timer 
Wireless Motion Detectoi^ 
Wall Switch Modules 
Telephone Responder 
Wall Switch Module 
Burglar Alarm Interface 



X-10 POWERHOUSE (SS5400) 



A wireless 4 piece home security system 
that Installs in minutes without tools or 
wiring. The professional features and re- 
liability of the SS54D0 can protect up to 1 6 
O doors / windows and control up to 8 re- 
O motel y operated lights simply by adding 
additional X-1 PowerHouse modules to 
the system. 



SYNTAX PROTOTYPING PCB 

FOR All PC-BUS(S: AT, MULTI, PS, S-1 00, VMS, * XT. 
FOR ALL PC-BOARDS; IC, TRANS, & UNI. 

RADIO COMMUNICATIONS 

MOTOROLA SPIRTT t, tl, ft III, & lU the acHSUfkl. 

BATTERIES 

PinzitHilc Alkaline & N^d, Powvr isnk luted leid- 
acid. 




SECURITY SYSTEM 

Vehid« aiamq, PIR, lireni, & home »airJty. 

TESTINQ EQUIPMENT 

IC Teller, f lultt Mclen. 

DIGITAL VOICE PRODUCTS 

DVM-3g04, OVM-SeC, DVM-5S05, & rroie. 

RF TRANSMITTER & RECEIVER 

TX-eS RF Tranimiiler 
RE-99 RF Receiver 



I 

P 



Et^OSDt 



MAIL ORDERS: 



ELECTRONICS 123 

17921 Rowland Street 

City of Industry, C A 91748 



TECHNICAL SUPPORT 

(818)912-9864 



ALL PRICES SUBJECT TO 
CHANGE WITHOUT NOTICE 



VISA »C It DtSCOVER CR£DIJ CARDS ACCEfTUI 


CANADIAN ORDERS: 


m 

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FREIQKT CHAROES ADO; 

UPS ■ Ground S S.OO 

SKondcdtylMMj i a.OO 

Next Day frad) $1S..0O 

C.O.D. ADD: $ 4.f}a 

CWJF.RESIOBNTSAOO: S.2S* Ss/m Tax 


All Olden muit tw PREPAID bv 
ctieck or credit cird (VISA, MC). 

Add i n^l rale of USStS.OO tor 

shipping and tiandling by U.S. 
POST OFFICE {airl. 



CIRCLE 2S4 ON FREE INFORMATION CARD 



60AS7 




LogloLab'''" Explorer 

The Soft Logic Bench 

NEWI Roleaso 3 



STILL ONLY 

$49.95 

LoglcLab is the first •ffordabl* logic simulator 
d«8igned with students and hobbyists in mind 

o NEW! Simuiotee a 2^ X 25" wire wrap board 
o NEWI Online manual & context-sensitive help 
o NEWI Online data sheets for all ICs 
□ NEW) Pin-outs available while wire wrapping 

Logicl^b givee you the simulated equivalent of: 

o A parts cabinet stocked with dozens of types 

of common 74LS-8ehes and CMOS ICs 
o A 16-channel, 1-nano&econd logic analyzer 
o NEWI l-land-he)d logic probe 
o Pushbutton switches and signal sources 
o LEO and sw en-segment indicators 

Send cheek or money order to: 

K.E. Ayers and Associates 

7825 Lwehwood St. Dublin. OH 43017 

30 day money-back guarantee 

Requires an IBM-PC/XT/AT (or compatible). 640K, 

DOS 3.2 (or highe^ , ECtA or VGA, and a mouse 



SUPER NEW FEATURES 
ADDED TO PCBU 



EASY TO USE CAD SOFTWARE 
THE BEST JUST GOT BETTER 



AUTO TRACK NECKING 

This feature will AUT0MAT1CLLY ADJUST 

the track according to the DESIGK rules you sat. 



Supports true CURVED Tracks. 

Lets you verify your GER8ER output on screen 
before sending it to the PC Board house. 



'THE BESTPCB CAD A VAILABLE 



PCB II ' STILL ONLY $1 49 us ! ! ! 



R4 SYSTEMS Inc. 
P.O.Box 451 
West Hill, Ontario 
Canada M1E4Y9 

(41 6) 399-0943 



fFree Evaluation Package 
Write or Call Today 



] 



Download DEMO from BBS and SAVE $10 on your order 
BBS at 416 289-4554 (2400/8/N/1) 



CIRCLE 218 ON FREE INFORMATKW CAHO 



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CELLULAR TELEPHONE 
MODIFICATION HANDBOOK 



How do you reprogram cellular phones? 

• How to have two phones with the same number 

• Descriptions of cellular phone's vulnerabilities 

• Techniques for decoding & changing cellular phones' NAMS 
and ESN's 

• Where to buy programming devices 

• Chip supplier's phone numbers 

• Instructions on how to change phone numbers on all models 

• Cellular phone manufacturer's ESN codes 

Complete Manual only $79.95 

M.O. or C.O.D. to SPY Supply 

7 Colby Court Suite 215, Bedford, NH 03110 

(617) 327-7272 





Sold for educational purposes only 



60A58 



tAIG Electronic Chemicals 

for Manufacturing, Maintenance & Service! 



^roGold 

iold Conditioner & Pre&ervalive 

I Protects Gold Surfaces & 

Base Metals! 
» Improves Conductivity! 
I Forms Protective & 

AntMarnish Coating] 

* Reduces Wear & Abrasion! 

» Reduces Arcing & RFII 

■ Reduces Intermittent 
Connection Failures! 

roGold is specifically formulated to improve conductivity and protect gotd, i»»e metai$ and 
her precious metal surfaces. 

'common problem with gold plated surfaces is that the base metals migrats to the surface duo 
I gold's soft and porous nalune (dendrite corrosion), Orvce exposed, base metals oitidiia, adding 
nwanted resistance that impedes elactrical performance. Since gold piated s jrfac^ are thinly 
aated, they are susceptal^le to scratching & abrasion, further exposing the base metats. 
roGold, a one step treatment, conditions gold connectors, contacts and other metal surfaces, 
nhancing the conductivity characteristi(» b efficiently transmit eiectrical signals. 
lon-abrasive/non-corTosivefom)ula,non-llammable, non-toxic, ozone-safe. 




DeoxIT & PreservlT 

Deoxidizer, Cleaner & Preservative 

• Improves Conductivity 

• Reduces Intermittent 

Connection Failures 

• Reduces Arcing & RFI 

• Reduces Wear & Abrasion 



Extended Temperature Range, 

-34-C to ZOO'C 




DeoxIT, a one step treatment, is a fast-acting deoxidiring solution that cleans, preserves, 
lubricatesandimprovM conductivity on all metal surfaces. Temperature rartge -34°Cto200°C. 
Non-flammabie, non-toxic, non-corrosive, non-gumming, ozone-safe. 

PrM«rvrr, seals, lubricates and preserves metal surface for protection from oxidation and 
contaminatian. For use on clean surface or ones pre-cieaned with DtoxfT. Temperature 
range -34=C to 200°C. Non-flammable, non-toxic, non-corrosive, non-gumming, ozone-safe. 

These new advanced formulas contain improved deoxidize rs, preservatives, conductivity 
enhancers, anti-tamishing compounds, arcing & RFI inhibitors and provide extended tempera- 
tune range, DeoxlTs new formulation also prevents dissolved oxides/contaminants from re- 
attaching to metal surfaces, providing longer lasting protection. 



OpticALL enectivefy dears, perishes 
and eiminaes static electricity on opttcai 
vi wing surfaces, OpticALLisalsoreoooi- 
mended as a generaj purpose entisiatic 
deener on plastic, glass and meiai sur- 
faces. 

StaticALL eHedivety neutralizes sUc 
htild-Lp caused lj^ friction and lew humid- 
ity conditioos, 

DuStALL quicky and safety removes 
du% int and particles from sensitive eiec- 
Iroric equipment, computers, lab equip- 
ment opdcal grade surfaces and other 
mechanisms and equipment 

FreezALL quiclity and safely cods 
circutsto -54'C. LocatBs Intamitlent com- 
ponerts due to heat failure and liaitline 
crad(s on PCBs, 

MeChanlcALL - High Penetrating 
Anb-Corrostve Anti-Tamishing CIsiner & 
Urixicant Liixicdfis & P rotec^, Displaces 
Moisture, Stops Squeate, M igrates & Coets 
Entire Surface. 

Electric ALL - Rejuvenating Sdu- 
tonFcrAIIEIectricaJApplications. Cleans, 
Preserves, Improves i Protects Connec- 
tlcxis, Flemcves Conoeion & Oxidation, 
Reduces Wear, Abrasion, Arcrg t PR. 
DegreasAU. •Fordegrsaslng.dean- 
ing and defliaine equipnvarA and parts. 
Remises ol, grsxe, dirt and contami- 
nante indudr^ roein tXiK from PCBs, com- 
ponents arxl metal parts. Biodegradable. 
CAE0N27 -ForsensWvBeqiipment 
appJfcations. For remc«ral at at. grease and 
dirt from surfaces. preoft'TF ). 
C A EO N 28 - Degre^er and cleaning 
liquid remcwes organic connaminanls in- 
cluding rcein fkx frotn PCBs, componertis 
and metal parts. ^morfTUO). 

X-10S Instrument Oil - contains 

sIBcorie. Frost qualty instalment oil tor 
'use on nijber, places and me<als. Korv 
gum mir>g, rust InhibUng, long lastinQ lutiri- 
cation. 

X-10 Instrument Oil- Lubricates 
predsior IrBtiuinents, fine parts and mecha- 
nisms. Use on al metals (gauges, gears, 
clocks, instruments, etc.). Non-gumming, 
rust inhblbng, long lasting lubticatian. 





We *sre having tmoble with edge cormctcts in out manukictiffing enwooment until we tiied 
"roGokt Wlp*f...great product ' J- P.. General Electric 

'Static and dirt buMup on our CRT screens have always been an annoying problem. We have 
'estsd many products andSndOptlcAU. to last cmsiderably longer and workjusias well on our 
olastic and metal enclosures, ' 

A. R,, University of Maryland, College Park, Dept. of Physics & Astronomy 

'FormanyyMK we havebeen using Caig's liquid end spray produets in the lab iorsenneo and 
repair of connectors, switches and potentiorr>et6rs. I Mso use their paste products on my boat 
to prevent cenosion from salt water and air..,Sne product for a variety of applications'. 

T. S„ University of Califomia, Lawrence Uvermore National Laboratory 

'Corrosion profefems on vwy sensitive connectors have been an annoying problem for us. We 
have tried many products mlhout success until we tried Caig's DeoxIT. DeoxIT is the only product 
that has worked perfectly. We Nghty recommend it'. RV., Xaroit Corpor atai 



CIRCLE 2»2 ON FREE IKFORMATION CARD 



Caig Products 

Afflpex 
Boeing 

Capitol Records 
Dietiold, Inc. 
Doitiy Laboratories 
Qeneral Electric 



uMd by thoH who demand the betti 

Motorola 



Grumman Aerospace 

Hewlett Packard 

Honeywell 

IBM 

John Fluke Mfg. 

Mcintosh Labs 



RCA 

Switch craft 
Texas Instmments 
Xerox Corp. 
. . , and Many More 




i ULBOSATORIES, IHC. 

•Environmentally Cansdous^ 



16744 W. Bernardo Drfva, 
San Diego, CA 92127-f904 

Phone:(619)451-1799, 
FAX; (619) 451-2799 



I 

3 



S 

z 



60A59 



We Sell QUALITY PARTS • We Have DISCOUNT PRICES * We Ship FAST 







Switching Power Supplies 1 12.6 Vet 2 Amp X former 




50 WATT 

Computer Products # XL40-8301 
Input: 115/230 Vac 
Output: -12Vdc@0.2A 
12Vdc@2.0A 
5.1 Vdc@3.5A 
Switching power supply. Regulated. 
6.30- X 3.93" X 1.9" high. 
CAT* PS-SI $15.00 each 

74 WATT 

Open frame switching power supply. 

Input; 120^40 Vac. 

Output; 5 Vdc@4.0Amp. 

1 2 Vdc @ 4,5 Amp. 

5.85" X 3.28" X 2.25". 

Must be tested under load. 

CAT#PS-74 $20.00 each 

76 WATT 

Computer Products # XL50-8601 
Input: 115/230 Vac 
Output: -12 Vac @ 1.0 A 
12 Vdc @ 1.0 A 
5 Vdc @ 6.0 A 
Regulated switching power supply. 
7,75" X4.Z5-X 1.78" high 
CAT#PS-76 $20,00 each 

10 WATT 
Enclosed 
Switching 
Power Supply 

Input: 117 Vac 

Output: 

+5 Vdc @ 6 amps 
-5 Vdc @ 1 amp 

+12 Vdc @ 3 amps 

- 1 2 Vdc @ 3 amps 

Regulated switching power supply. Over- 
load and short-circuit protection. Voltage 
adjustment trimmer. Fused. Requires stan- 
dard I EC type power cord. 14' color coded 
wires terminated by molex-type connectors, 
Black=ground, R©d=+5, Green=-5, 
White=+12, Blue=-12. 9.62" X 3.5" X 2.22" 
vented aluminum chassis. 

CAT#PS-SO $22.00 each 




^ 



B 



Same as Mouser 
#41FG020. 
12.6 Vet, 2 Amp 
power transformer. 
2"X2.35"X2.10". 

2.90" mounting centers. Pigtail leads. 
CAT#TX-122A $4.00 each 
10 for $37.50 



Switches 



Heaw Duty Reed Switch 



No specs available, but this glass encapsulat- 
ed reed switch Is larger than most we've 
seen. Single pole, normally open. Glass 
body is 2" long. Leads and contacts are 0,1" 
wide metal. CAT# RSW-6 75 e each 

Mini PC Pushbutton 

Alps #15 Very tiny SPST, 
normally open, pc mount 
pushbutton switch. 0.235" 
square X 0.35" high. No pushbutton cap avail- 
able, Ideal for circuits requiring inexpensive 
switches were looks are not important. 
CAT#PB-39 5 for $1.00 



INFRARED Remote 
A.C. SWITCH 



/ 



^ 



ULU 




This infrared remote control device lets you 
tum on/off lamps, appliances or other 120 Vac 
devices using an IR transmitter similar to the 
one on your TV or VCR. Originally designed 
for use with a hydromassage unit, these trans- 
mitters and receivers will apparently operate 
most A.C. devices with 2 prong non-polarized 
plugs. Not recommended for use with heat- 
ers. Requires a 9 volt battery (not included). 
CAT# RC-1 $9.95 • 2 for $17.00 




DOLLAR BILL SWITCH 



We sold out of these 
popular dollar bill 
switches fast year, 
but now they're back! 
Insert bill into chute. 
Magnetic head and 
infrared sensors 
analyze bill for 
authenticity and 

position, if anything is wrong it kicks the 
bill back. If good, bill passes through the 
chute and a 5 volt current is switched. Will 
pass any size U.S. bill. It cannot differen- 
tiate between $1, $5, $10 etc. Operates 
on 12 vdc. Solid metal housing 5.32" x 
4.1" X 5.21 " high. Chrome dollar chute 
extends 1 .34' in front. Removed from new 
equipment. Guaranteed. 

CAT# DS-2 $25.00 each 



Electrotuminescen t 
BACKLIGHTS 




At iasti A low cost electroluminescent glow 
strip and inverter. These brand-new units 
were designed to backlight small LCD TVs 
made by the Citizen Watch company. The 
inverter circuit changes 3 or 6 Vdc to ap- 
proximately 100 Vac, the voltage required 
to light the glowsirip. Luminescent surface 
area is 1 .7" X 2.25". The strip is a salmon 
color in its oft state, and glows white when 
energized. The circuit board is 2.2" X 1'. 
Glow strip and circuitry can be removed 
easily from plastic housing. Ideal for spe- 
cial lighting effects and backlighting. 

Citizen* 92TA operates on 3-6 Vde 
CAT# BLU-92 

^J.dU GdCn QUANTTTY 



10 for $32.00 



AVAILABLE 

100 for $275.00 



UJ 

60A60 



TOLL FREE ORDER LINES 1-800-826-5432 

FAX (818) 781-2653 • INFORMATION (818) 904-0524 

Minimum Order $10.00 • All Orders Can Be Charged To Visa. Mastercard Or Discovercard • Quantities Limited • 

California, Add Sates Tax - S/iipprng And Handling $3.50 For the 48 Continental United States - All Others Including 

Alaska. Hawaii. P.R. And Canada Must Pay Full Shipping • No C.O.D. • Prices Subject to change without notice. 



■ 



We Sell QUALITY PARTS 



We Have DISCOUNT PRICES 



We Ship FAST 




C Board w/Rf Modulator 
(and lots of other parts) 



HIGHEST QUALITY METAL CASSETTES (Erased) 




We recentf/ received a load of these 
PC boards which contain, among other 
things, a RF modulator. With a little 
desoldering you should be able to 
liberate a working unit from the board. 
Also contains a 7305T vtgltage regulator 
with a couple of heatsinks, 20 ICs. ca- 
pacitors, resistors, diodes and connec- 
tors. No hook-up information available 
on the modulator. 
CAT# VMB-1 $2.75 each 



RELAYS 



A GREAT DEAL on 10 Amp 
Solid Stats Ralaya 

1 amp solid state relays, 
removed from equipment 
and tested. Control voltage; 
3-32 Vdc, Load: 10 amps up to 250 Vac. 
Standard "hockey-puck" size: 2.27" X 
1 .72- X 0.95". UL and CSA listed. 
CAT# SSRLY-11 U $8.25 each 
10 for $80.00 

5 Vdc Latching Relay 

Omron # G6EK-134P-ST-US 5VDC 
Tiny. DIP compatible, 
dual-coil latching, SPOT 
retay. 5 Vdc, 1 23 ohm coils. 
Contacts rated 2 amps @ 30 Vdc. 0.62" 
X 0.38- X 0.3" high. Sealed black case. 
TTL compatible. UL and CSA listed. 
CAT#LRLY'3 $1.75 each 



F 



0D30 



Premium quality metal tape in 0-60 cassettes (30 or more per side). 

On© of the finest "brand-name" tapes on the market, in durable, dear 

plastic b'ansport mechanisms. Recorded and bulk erased, the 

record-protect tabs have been removed and therefore, need to be 

taped over to re-record. Audiophiles will appreciate tiie wide dynamic range of this tape. 

If your cassette deck has a "metal" setting you will hear the difference. A real bargain! 

CAT#c-600M $1.25 each 

10 for $10.00 
CASSETTE STORAGE CASE 

Black, unbreakable plastic audio 

cassette storage case. 

CAT#CBOX 5 for $1.00 • 100 for $15.00 




CABLE TIES 



Apfirox. 

4" 




TR-400 

TR-4(J0B 

TR-600 

TR-600B 

TR-600 

TR-eOOB 

TR-1100 

TR-1100B 

TR-1S0O 

Heavy-duty 
TR-1S00HD 15' 



4" 
6- 
6" 
8" 
8- 
11- 
Il- 
ls' 



Mn. Ttnttt 

18 lbs 
18 lbs 
30 lbs 
30 lbs 
50 lbs 
50 lbs 
50 lbs 
50 lbs 
50 lbs 
1 5" cable 
120 lbs 



neutral 
black 
neutral 
black 
neutral 
black 
neutral 
black 
neutral 
tie. 
neutral 



15/16- 
15/16- 
1 1/2" 
1 1/2" 
1 3/4" 
1 3/4- 

3" 

3" 

4" 

4 1/4- 



.30 
.35 
.50 
.50 
.60 
-70 
.70 
.80 
$1.00 



$2.50 
$3 00 
$4 00 
$4.00 
$5.00 
$6.00 
$6.00 
$7.00 
$8.00 



$15.00 
$17.50 
$30.00 
$30.00 
$40.00 
$50.00 
$50-00 
$60.00 
$70,00 



$1.50 $12.00 $100,00 



D.C. Wall Transformers (all are 120Vac) 




Volta 

4 Vdc 
6 Vdc 
6 Vdc 
7,5 Vdc 
8.3 Vdc 
9 Vdc 
9 Vdc 

9 Vdc 

10 Vdc 
12 Vdc 
12 Vdc 
12 Vdc 
12 Vdc 

14 Vdc 

15 Vdc 



Amp» 

70 ma. 
200 ma. 
300 ma. 
400 ma. 
10 ma, 
200 ma. 
300 ma. 
300 ma. 
SOOma. 
100 ma. 
500 ma 
800 ma 
1 Amp 
700 ma. 
400 ma. 



Plug Style 
2,5mm co-ax 
1 .3 mm CO -ax 
2.1 mmoo-ax 
1 .3 mm co-ax 
battery snap 
2.1mm co-ax 
2.1 mm co-ax 
2.5mm co-ax 
2.5mm eo-ax 
2.1mm co-ax 
2.1mm co-ax 
E, 1mm co-ax 
none 

1.3mm CO- ax 
2.5mm co-ax 



Center 

negative 

negative 

positive 

negative 

positive 

positive 

negative 

positive 

negative 

negative 

positive 

negative 
negative 



Catg 
DCTX-470 
DCTX-621 
DCTX-632 
DCTX-7S4 
DCTX-8310 
DCTX-920 
DCTX-932 
DCTX-931 
DCTX-1050 
DCTX-1210 
DCTX-125 
DCTX-1281 
DCTX-121 
DCTX-1470 
DCTX-1540 



Price 
$2,00 
$2.25 
$2.75 
$3.25 
$1.50 
$2.75 
$3.00 
$3.00 
$3.50 
$2.50 
$4.50 
$5.25 
$6,50 
$5,25 
$4,50 



Style 
C 
C 
C 
C 
C 
C 
C 
C 
C 
C 
C 
C 
A 
C 
A 



11" X 4" Glow Strip 



Powerful Magnet 



1 1 ■ X 4' electixjlumine scent 
glow strip. Great for oonfi'ol 
panel backlighting or special 
effects lighting. Operates on 
120 Vac, Salmon cokir, 
9' long wire leads. 
CAT#GS-1100 
$5.25 each 



CALL OR WRITE FOR OUR 
FREE GO PAGE CATALOG 

WITH OVER 4000 PARTS! 

OUTSIDE THE U.S.A. PLEASE SEND 

S2.00 POSTAGE FOR A CATALOG 




Q 



Powerful neodymium 
rare-earth magnet 
Oiginally for use in 
permanent magnet 
d.c. motors. Irregular shape. Approximate 
dimension: 1 1/4" x 3/4" x 1/2" thick. 
WARNING • Don't put your hand 
between magnet and metal objects. 
CAT# MAG-2 $7.50 each 




Style A 



Style C 



TOLL FREE 

PHONE ORDERS 

1-800-826'5432 



CIRCLE 3% ON FREE INFORMATION CARD 



MAIL ORDERS TO: 
ALL ELECTRONICS CORP. 

P.O. Box 567 
Van Nuys, CA 9t 408-0567 



I 

3 



m 

a 

3 

g 

01 

Z 



60A61 



(O) 



HITACHI 



i**'! 




MBCL DESCRIPTIOK 



MODEL # 
V-Z12 

#»'«r»#'' REGULAR 

r w"<, $525.00 

SALE 
$399.95 

DEaiUUt SALE 



20 IHi, Duti Clitnntl 
eo Wi, Outl Chinnel 
CRT Redout 

£0 tVi, Dui1 Chinn»1, DciiyKt Shh|i 
CRT Rejdout, Cursors, Counttr 
100 mi, Dtiil Chinnel 
CRT Readout 
V-10«M 100 rWi, Ouil Chinnel 
CRT Readout, Cursors, 

DIGtTM. STWME (^ItUKCOPES 



V-Zl? 
¥-660 



»-10W 



Delayed Sweep, 



Delayed Sneep, 

. Delayed Sweep, 
Counter 



»C-«)23 ? Ch, M Wi. M MS/s, t W/ch, 
llS-232 H/KPEL support 

TC-S02* 2 Ch, 50 NHi, 20 HS/s, 2 «(/ch, 
RS-232 w/HPGL support 

W-eOZM 2 Ch, 50 HHi, 20 MS/s, 50 MHi Repet- 
itive sanpl1n(f. 2 KH/Ch, fret^u^ncy 
counter, RS-232 M/HfGL support 

VC-«OiS« 2 Ch, 100 Wte, to nS/s, 100 HKi equtv- 
tltnt sMpltng, t m aoi, fre<iueni:y 
counter, RS-232 u/HPiL support 

VC-C145 4 Ch, 100 mi, 100 ns/s (i ch), « w 

■«■, counter, RS-232 h/H?GL support 
yC^SlSS 2 Ch, 100 MHi, 100 HS/s (2 ch), « KM 
Ben, counter, RS-232 w/HPGl support 



525. M 399.95 

13»5.O0 10JS.95 

IMS. 00 1285.95 

1S4S.00 13S5.9S 

1S95.O0 1«45.95 

tS95.00 CALL 

2195.00 FOR 

mCE 



H95.0a 

I 

3295.00 
4195.00 
3995.00 



OUOTES 



INT 



FroduDia trHvmallonal 

8931 Brookville Rd, Silver Spn'ng W 20910 
800-638-2020 * 301-587-7824 * FAX 800-545-0058 




In-Circuit And Out-Of-Circuit IC Tester 

MODEL REGUUR SALE 

560 Special $3500.00 $2595.00 

* Includes AK~560 User Program- 
mable software, ($495 value), 
and model #2520 Digital Stor- 
age Scope, ($1493 value), at 
NO CHARGE!!! 

560 $3500.00 $1995.00 

* Includes AK-560 at no charge! 

2520 $1493.00 $ 695.00 



INT 



Product* imernBtlianBl 



8931 Brookville Rd, Stiver Spring Kl 20910 
800-638-2020 * 301-587-7824 * FAX 800-545-0058 



a 



I 

to 



2 

1 



60A62 



CIRCLE 2S4 ON FREE INFORMATION CARD 



CAD (Circuit Analyzer & Designer! VERY AFFORDABLE BREADBOARDS 



These CADs have everything you need to design, test and analyze 
circuits. They've been adopted by major colleges across the U.S. 




▼> W-a^ ■■;■ 




TD107 $159^^ TA102 $149»» 



Built-ins include: 

• regulated +5VDC a ±12VDC 
•1Hz'1KHz/100KHzclocl« 

• logic probe 

• 0.5Hz/500Hz pulse generator 

• 8 data sviritches & 8 logic LEDs 

■ 2 complementary logic switches 

• 3 breadboards (1 380 tie-points) 
expandable to 2020 tie-points 



Butlt-ins include: 

• regulated, variable +15VDC 
•15VAC and 30VAC supplies 

• sine, square & triangular wave 
generator (200Hz-200KHz) 

• 1 Knand 1 0OKapotentlometers 
■ speaker 

• 3 breadboards {1380 tie-points) 
expandable to 2020 tie-points 



Acces. Your 
Panel Cost 



Model Contact Bind'g 

Jip.^ Points. Posts 

BB100 100 

BB640 640 

BB740 740 

BB840 840 

BP605 1,620 4 

BP610 2,230 4 

BBIOQ 




t3P60b 



BB64C 



BB840 



DIGITAL CLAMP "AMP-VOLT" METER 



Fax, call or circle response card for FQELcatalog. Minimum order $25; 
minimum SSH $5 ($8/unit for CAD); CA customers add sales tax; POs 
OK for qualified accounts; send order with check or money order to: 
JPC International, Inc. 
P.O. 8ox 55, Agoura Hills, CA 91376 
Tel: 818(707-1514 • Fax; 818^'07-7327 



JJT 



Unique clamp-on voltage test lead 
design maizes measuring voltage 
just as easy as measuring current. 

MC500 $74"' 

• measures up to 300 Amps AC, 
750 VAC and 2K ohms 

• ruggedized construction 
■ continuity beeper 

• data hold 

• hard leather carrying case 
' overload protection 

• low battery indicator 



A 



clamp-on 
voltage test 
lead 




CIRCLE 297 ON FREE INFORMATION CARD 



ALFA ELECTRONICS 




DMM 2360 

$129 J5 

DMM + LCR Meter 
Most VersatiU DMM 

Inductance: lnH-40H 
CapBdtancs: 1pF-40)iF 
Frsqusncy: 1H; - 4MH2 
T9«rp«mwr«: -40 - 302T 
Uflfc TMt; aOMHz 
Obde. Cixttnutly 
Vol Amp, Ohm 
3999 count iH^y 
P^A HoM 
Auu pcwsr oA 



ana 


i^-"' 


i. F 


H» — ^^ 


(. ® . ® 

f s 



DMM 175A $S7.95 

DMM with 20 MHz 
Frequency Counter 
Mast popular DMM 

Fieq Count«r 1Hz-£0MHz 
XV .ImV-IOOOV 
ACV .ImV-TSOV 
ACA/OCA .ItnA-lOA 
R .1Q-2000MQ 
Cap IpF-JOjiF 
m logk; t«t :a MHz 
Translslof HfE Ml 

nods l«St 

LED te^ 

to MQ 



QiM/jrv rtsr eqiupmlnt 

AFmiiDABLE PRICE 



Fluke Multimeter 

Rjke 70 II J62 

FIjhe 73 II $87 

Fluhe 75 II $126 

Flute 77 II $145 

Fijte 79 li $165 

Rule S3 $215 

Ruke 85 $265 

Flute 87 True RMS $285 

Rute Se Automotive $359 

Flute 8S $^19 





LCR Meter 814 
$199.95 

The Best Handheld 
LCR 

lndii«ani»fl,1;iH-iOOH 

Capadtancs lO. 1pf -ZO.OOOiiF 

RMis)ance:1 ma^OMQ 

1% bsTic aixuiacy 

DiaslpaQon factor hdlcatss leaKage 

In capaotQr and Q factor in Mudor 

Zsro adjustmett to mducB parast- 

iScs Irom lest Murs 

Very good lot ttgh fiWfieit:^ FIF 

and surface tnaait ccfflpooentt. 




LCR Meter 195 
$119.95 

Venf popular LCR 
lndw<ance:1uH-!(J0H 
Cafiatlranea^),lpF-?oo nF 
Reslsiancs:a.0ia-20Mn 
Basic acairacr.R:l%, C2%, 

Tesi ti«(i»ne|? 1 Mte 



SS& 




Capacitance Meter 
7705 $57.95 

> 0.1 pf-20,IX}a^ ki 9 langas 

j D.S% bia^ accwacy 

Zaro ad|ustmenl ± 20pF lo oompen- 
saia parasUcs Iroir test Itebire 



Alto Avertable: 
H«avy duly DMM 
AC/DC ckinp melw 
Th«(matn*tar, lux mslet 
pH matM, Lo^c pcob* 
Mgh voltag* pfob« 
RC oiclflcrior 
Elactranlc icals 
F»»qiwficy eountaf 




*i 



20 MHz Oscilloscope with Delay 
Sweep PS-205 $429.95 

Dual Trace, Cotnponatl MM, 6* CRT, X-Y OperslSon, TV 
Sftc, I Ittodulatian, CK2 OuHwl, Graticule Ilium, Z pnibes 
xi, no. Sat price wlh delay tnveep. 
PS'2Q0 20MHz DUAL TRACE $339.95 
PS-dOS 40MHz DELAY $569.95 

PS-60S 60MHz DELAY $769,95 



20 MHz Digital Storage 
Oscilloscope DS-203 $769.95 

Swlchable UXmm dlgtial and analog 
2 K word par chant»l storaoa 
Sarrphg rale: 10 M satrple Aec 
8 till vertical reeoknion (^ Lar^dv] 
Bpanded Tknebase lOmsfdIv ■ Oi iMhi 
Relnsh, 1^11, Saw al. Save CHZ, Pra-Trtg 
FMItr Contid 









i _ 


.» i: 


i 

•e 



Power Supply 
PS-303 $169.95 

0-30 VDC , 0-3A output 

0.0£% + 2inV mt leguliikin 
0.02^ + 3mV load i«gubiton 
1 mVyme note and itpple 
Short circuH attd omikied pictecled 



[>u '^r^\^ 



4 • 



h. i 



Power Supply 
PS-1610 $299.95 

0-16 VDC ,. Q-lOA output 

Constant wbge & omstan cunen mode 

a2K*ZmV \km legutaHen 

D.04% t2niV bed leguletlon 

ImVniis miee and rl^le 

Stwil cktul and oMitoad piotected 






1 




,<■, 


r 






■ - ■ 



RF SIGKAL 
GENERATOR 
SG-4160B $124.95 

100 mzASDUHi strswava k\ G 

Bruges 

Ov^in lIXknVrTr» to 35 MHz 

Internal ikHi, EMmal 50Hz-aite 

modulallcn 



RF SIGNAL 
GENJCOUNTER 
SG-4162AD $234.95 

Getteraies RF s^gnil same a SG- 

416Ge 

Fiequertcy ceunHf Wl -1S0MH; 

SensitMly .SOmV 

Foe merraf and external MUices 



AUDIO GENERATOR 
AG-2601A $124.95 

lOHi - 1MHz i\ S ranges 
Output: SVtttis sine, 1DV>f squarawave 
Syndiicnizatlon: ±3% ol osdtatlon tre- 
qu«ncy per Vrms 

Output dbioitbn: D.DS% SOOKz - JQkHz 
0.5% 50Hz • SOOttHz 
Output Infiedance: GOO oln 



AUDIO GEN^COUNTER 
AG-2603AD $239.95 

Generate] audu lignal same as AG- 

seotA 

Fierjuency courier 1Hz-15aMHz 

EensUvlty <50mV 

For IniemBi and ettemal sources 



FUNCTION GENERATOR 
FG-2100A $169.95 

0.2 Hi - 2 MHz In 7 rangra 

Sine, square, triangle, pulse and ramp 

Output: 5mV-2Dyp-p 

1% (Jsortion. DC ofls«i ± lOV 

VCF: 0-10V control fiBquency to 1000:1 

FUNCTION GENXOUNTER 
FG-2102AD $234.95 

Qen«<We« signal same as F&21WA 
FiequencvTOunier 4 (Sab 
Feature TTL end CMOS ouijjiit 

SWEEP FUNCTION 
GENiCOUNTER 329.95 

OiMHz to S MHz 

Sweep; Urt lO:1A.og 10:1 20fflS to IS 

AM Modulation 

Gated Burs^ Volaoe Coitrol Geneotor, 

Generator Control Volage & G digit Countar. 



ALFA ELECTRONICS (SOO) 526-ALFA/C609) 275-0220 .SDAV money back guarantee tVEflRWAHRANTY 
DA Dnv QnOQ D.-;r.^nt»ri M l nocjt FAX: (609) 275-9536 WRITE FOR FREE CATALOG. PaCES Si;BJEimO CfHWiGE 

f.\J. BUA euey Krinceion, NJ UBM visa. Master Cord. American Express, cod, Puichrase Order welcome 



CinClf 2t3 ON FREE INFORMATtOH CARD 



60A 




MIXED-MODE 
CIRCUIT SIMULATION 



ENTER THE FUTUREOF ELECTRONIC DESIGN! 

TopSPICE 

The affordable, 

True Analog/Digital/Behavioral 

Mixed-Mode Circuit Simulator for PC ^ FfW\ ^ 

• Simulate circuits containing any commnation of 
analog and digital components. • Complete SPICE 

analog simulator with extended syntax. * Fully 
integrated event-driven logic simulator. • Analog 

Behavioral modeling using arbitrary equations, 
Laplace transforms and look-up tables. • Analog and 
digital model libraries. • Graphics post-processor. 

• Comparable to professional systems costing 
thousands more! 

npu 7 M B To order your copy call 

rCNXAIf 800-272-0674 

DEVELOPMENT p^, (g^gj ^^,^^^^ 

P.O. Box 10358 

Canoga Paric, CA 91309, (S18) 594^363 



CABLE T.V. 



^^E 



FALL SALE 



(JUANll i V 



SB-3 

TB-3 RiHifliTS 58 54 48 

FTB-3 ilBii 79 59 55 49 

SA-3 ^Qu|w79 59 55 49 

JERRQLD DPV7 CALL CALL CALL CALL 

PANASONIC 87 74 69 65 



ZENITH CALL CALL CALL CALL 



Octllcr Pricing prices Subiect in change 

MONEY BACK 
GUARANTEE 

Please have MAKE and MODEL used in your area when calling. 
Anyone Implying Theft of Service Will be Denisd Assistance. 

We Have The Best SERVICE AFTER THE SALE 



CMC Concepts Inc. 
P.O. Box 49503 
MPLS., MN 55449 



NO MN. SALES 









8 

c 



CODE RES992 




POWER SYSTEMSand 



accessories., 



ALL SYSTEMS INCLUDE. 



r* Mothertmaid 


* 1 3.5" 1.44 MB Floppy Drive 


•2 Serial Pons 


* Moose ^ 


*RAJM 


* 1 5.25" 1.2 MB Floppy Drive 


• 1 ParaUel Port 


• Windows™ 3.1 


♦Case 


* 1 105 MB Hard Drive (IDE) 


♦ I Game Port 


* DOS 5.0 


* Power Supply 


* Hand Drive Contn^er (IDE) 


* 14" Mocitor 


* FCC Approved 


* KeytwaPd 


• Floppy Drive Contrdler 


•Video Card 


• 1 Year Warranty! 



QUALFIT 

IBM™ 

PC/AT COMPATIBLES 



Technical 

Assistance/ 

Custom 

Quotes 

VIA FAX 



Mcst configurations availabie on 

request! Choice of desktop or 

mini -tower case. Additional RAM 

available on all systems! 



386SX-25 

SVOA MoiitDr 

<l(E4l76S. .39DP) 

i MBKAM 

$1454 



386SX-25 

SVOAMcniior 

(T024i7»l, .MDP) 

4MB RAM 

$1566 



386DX-33 

SVGA MtmhT 

(1024i7«l. .3»DF) 

2MBKAM 

$1614 



f^ 



3B6DX-33 

SVOAMmilcir 

4MB SAM 
$1711 



486DX-33 ^ 




4S6DX-33 ] 


SVOK Moniliir 




SVOA Mnum 


(I(K4i7*S, .»D?) 




(10241768, .MOP) 


2MB RAM 




4MB RAM 


$1974 




$2071 



MOTHERBOARDS 

ECS 

3S6SX-M 
3t6DX-J3 t\Wa 
4S6D>:-J3 tl»K) 
BIOTTAII 

2M-20 
JS6SX.M 
}!6DX-U (i4K) 
4!6-DX.33 (64K} 



U3P 

S3 IS 

S6» 



IMX<j.SO SIMM 
IMXe-TO S[MM 
IMXil.«0 SIMM 
4M:<9-70 SIMM 
J56KX1-S0 DRAM 
IMXI-m DRAM 
«<IKX4-S0 DRAM 
I56KX4-80 DRAM 



S4.^ 
S4i 
S«l 
S!.H 

S4.9fl 
$3JS 

S5.2? 



VIBEO CARDS 

OAK Oil, 800x600, 256K S3« 

OAK 067. 1(I24«76S. 511K 176 

PARADISE IO:4s7M. 256K S76 

PARADCSE l(C4l768. 5iIK SM 

PARADISE 1024!l76S. IM %!<» 

PARADISE l(H4s768. IM. NI S! IS 

MENTOR 1014x76*. iM (Er4C(ri Sill 

MONOGRAPHIC! CARD SJI 

MONITOilS 

SVGA, 1018x768, ,38DP, NI SJ64 
SVaA.HII4i76B. .28DP, INT %32i 
SVGA, l(324v76S, J9DP.iNT SMS 



I/O CAMPS 

PARALLEL Sli 

SERIAL S21 

AT/IO (JS'lPnG) 524 
2 DRIVE FDC SJ3 
4 DRIVE FDC SJS> 
MULTI-ATflO S42 
(IDE'FI>C/2SIIP/IC) 



FLOPPY PS IVES 

ly 1.44MB S63 
i.Vi- 1.3MB J63 
PD-W DUAL SI7M 



TAPE DRIVES 

IRWIN 1 20 STD SJ(W 
IRWIN IW STB. 5I7V 
IRWIN 120 PLUS S27V 



ntlSCt 

SX » NOTEBOOK PC S17W 

DOS5.0 S6St 

WINDOWS™ 3,1 UPGRADE S49 



SVOA. IT. 1280x1014 
MONO 14- .V.1BER 
KEraOAROS 

RJin-SU 4700 TACTILE 
LITEON 101 TACTILE 



SMS 

Sll« 



S49 



UTEON 101 MECHANICAL S44 



PtUHTSRS mOTHEfu 

HL-IOV LASER Sll^ 

M-!30» MATRIX (1!» 

M-1324L MATRIX $219 

M-1924 MATRIX i»49 
£ASES 

DESKTOP W/PS i*6 

MINI TOWER W/PS S« 
MED TOWER w;ps SIW 
FUU TtJWER WiPS SI3» 



CP ROMS 

CHINON CDS 4il IKT. Hm 
CHINON CDY «l ECT. S.^29 

ManKMS 

2400 BAUD INTERNAL S!6 

2400 BAUD EXTEiUJAL S79 

24CC IhfT WfSENDJRCV FAX SU9 
9600 EXT W/SENttHCV FAX SSS"* 
l+WO EVT W.'SEND/RCV FAX UliJ 



SCASNBBS 

GENIUS GS40in J121 
GENIUS COLOR %ii1 



COPROCESS ORS 



XT.'AT 

BAEV TOWER 
FULL Tt)WER 
MINI- DESKTOP 
AT 



in 

S52 

S6.1 



CtfT 


CYttlX 


SX20 SI 19 


S30 %\2S 


3X2,1 SI 44 


S» SI49 


DX15 1163 


D2.S 117!) 


DK33 SISJ 


D33 SI89 




D40 iim 



9:00AM-5:00PM 

PACIFIC TIME 

MON.-FRI. 



LI.XIMB IDE 
i;OMB IDE 

210^^B [DE 



S32V 
«S9 
(«i9 




MI£ZiBamTJNG..XtMy.lCES 

GENIUS CUX-ES S29 

MOUSE WfWINDdWS" 3.1 BUS i»9 

MOUSE Wi-WINDOWS™ 3,1 SERIAL S86 
GENIUS 1 2 12B TABLET «W 

O^^XA/CDf^ Y W. KO«pi VljIA. MASTERCARD. Mnaey Cbilen, pre-puel cflihim. perxMul w Kiaipwiy chccL ^alkm 7-10 d^ to 

■^T].'' ^^^iL - - -- cIbb). CiafDoHn m* DDtifiod of tny p™* chki^^ a( time of purthMe. Stuppmg And handling chirgA extf* & viry wt[h 
F J«2 1 50(|h ^'' ^™^ wsitfu inil tecUBCi. Nomal ihtpFirv vi. UPS Oitunii or Wi». wuilly wiihrn 7 diji. Wakinjton ntuliia kU 7.!» 
Sumnar, Wo. VaJVU ^^^ ^ ^^^ ^^^^ ^^^ »»«pc«l! visa/mastercard trier lubisci io3.S» SlmhMp. Av«il*liiy £ |!n«a 
cub|flc[ to c^ui^. All brind ind piodwi TubiM* iro tho iftiianvln ml refuu^Kl u-KknuvU of thoir r«(Mctive oocnpuvaa. For ^our protection. WE ALWAYS 
CHECK FOR STOLEN CRm^rT CARDS. Defectiyn kmhvire rcfilK«d/n|MirBl n tlw diKntioa {/ POWERGY. We (k> IK< allow iHn.dvfBcciw ntifw. Wb 
rcMTve [ho ri^l u> cubriitL4« « pnMluci of naquil or jr««tv vtlufi ^ qiulity ui Ihe «^.!nt of ■ idioclijte. Orden cmcdlled bcfofe ihipmcAI nAJKI lo i \i% 



ELECTRICAL 
ENGINEEIl 
ON STAFF 



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Wt itll onhr QUAim- /JEWS . 



INro:206.S63-5939 ORDERS ONLY =206^99-7028 FAX(ORDERSIQUOTES>=2Q6^78^796 




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Single Board 8S6 Coatpiten 

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t/ Laser Printer $45." |/ 
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90 DAY GUARANTEE — In order for the 90-day guarantee to be in effect, this form must be signed and returned. 

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HOURS: MONDAY THROUGH FRIDAY 9 A.M. TO 6 P.M. EST 

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[CL7106EV KIT LCD DIGITAL 
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ind small parts. Builder miM add 
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PS-1 $16.99 

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IX: . The LMSirr vollag« regulator 
provides excellent regulation and 
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3 DIGIT LED DVM ONLY 3" X 3" READS TO 
too V DC ORDER DVM3 $19.95 

FM WIRELESS BROADCASTER FMI $ 9.95 
8038 FUNCTION GEN. KIT FGI $9.50 

SEQUENCER PROJECT SEQKIT $9.50 

CHRISTMAS TREE PROJECT 
Build this unique seasonal project and have 
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70-WATT STEREO POWER AMP 

35 WATTS PER CHANNEL 
Now you ean boos ylour low power car 
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crease power to 1 00 or 200 watts/channel. 
ORDER PM-35 KIT $19.95 



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NE602 


$2.00 


UGN3013 


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ULN2429 


1.75 


ZN414 


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XR2206CP 


4.75 


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MAX232 


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ULN3330 


1.50 


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DANBKR SAl^ES COMP^rslY 

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TEKTRONIX P6015 NEW 

gh Voltage Probe, measures up to 
) kV peak pulse, 1 OOOX, up to 20 
' Dc * peak Ac. 75 MHz useful 
<i/, compensation range 12 pF to 
'PF. 

$275.00 



TEKTRONIX DM 501 



Igltal Multimeter, measures volts, 
irrent, re3l3tance,and tempera- 
ire. 1% Dc voltage accuracy, 
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jlly Isolated serial bed output 

\ 

i $250. 00 



WANDEL & GOLTERMANN 
T5A-f & SBA-f 
Trarismlssfon System Analyzer with 
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of measurement; Spectrum analysis. 
Network analysis, Selective level, 
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MAY SPECIAL $2950.00 



HEWLETT-PACKARD 80I8A 

Serial Data Generator, 2048 bit, 
dual channel memory, variable word 
and pattern length, TTL, ECL, CMOS 
compatible, programmable, prbs and 
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$950.00 



"^ MAY SPECIAL * 
HEWLETT-PACKARD J586B 

Selective Level Meter makes carrier 
measurements to 32.5 MHz, voice 
channel measurements from 50 Hz 
to too kHz, works with the 3336B 
level generator Options available, 

f 2650. 00 



HEWLETT-PACKARD 204C 



Sine Wave Oscillator, frequency 
range covers 5 Hz to 1 .2 MHz In 6 
overlapping ranges, solid state 
unit 



TEKTRONIX A6902A ISOLATOR 



Two Independently Isolated channels, 
high voltage/ high CMRR, VDE cert- 
ified to 1500V/channel. 



$175.00 



$350.00 



MARCONI 2380/2382/ 1 

Spectrum Analyzer, 1 00 Hz to 400 
MHz In 1 Hz steps, This Spectrum 
Analyzer combines exceptional 
amplitude accuracy and high 
resolution 75 ohm. 



$5000.00 



TEKTRONIX 485 

350 MHz Portable Oscilloscope, dual 
trace, 1 nS/dIv sweep rate, 2.0 div 
nS writing speed, switchable input 
Jmpedance, 



y 



HEWLETT-PACKARD 3582A 

.02 Hz to 25.5 kHz, transfer func- 
tion magnitude and phase measure- 
ments, coherence function measure 
ment, accuracy Is within 3% of 
display center frequency. Includes 
0.02 Hz resolution, CRT readout. 



$1300.00 



TEKTRONIX 466 



1 00 MHz portable storage oscillo- 
scope, 3000 div/uS stoned writing 
speed 



tn 75.00 



TEKTRONIX 7904 



dOO MHz Oscilloscope mainframe 
with the following plug-ins. 7A24 
dual trace amplifier, 7A26 dual 
trace amplifier, 7B85 delaying time 
base, 7B80 delaying time base 
Includes a manual for each plug-In. 

$2000.00 



mm 



$5900.00 



TEKTRONIX POWER MODULES 

TM 503 $200.00 

Three-wide power module accepts 
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Tti506 $300.00 

Six-compartment unit provides 
power to operate any of the TM 500 
modular plug-ins. 



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MISCELLANEOUS 
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TV NOTCH FILTERS. BROCHURE $1.00, 
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REMOVE TAMPER rosistant seourily screws, de- 
luxe 30-pc. set $29.95 plus $4.50 S&H. Send 
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CA 92128. 

pH METERS, Pocket type replaces litmus paper, 
automatic calibration. Monitor swimming pool, 
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CABLE TEST CHIPS. S-A 6550. S-A 8500 — 
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SOLAR PANEL, used 2 amp $165.00 plus $5.00, 
Dallas Solar Power, Box611327RE, San Jose, CA 
95161. 

TRANSIENT SURGE and ground fault protection 
now in one complete unit. $98.95 S.'H $S.0O. NY 
residents add appr sales tax. Safety Unlimited, 
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SHORT WAVE antenna, space saver 30 feet 14 
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set, less batteries and key $12.96. Camp. 4951 
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PLANS-KITS-SCHEMATICS 

DESCRAMSLER KITS. Complete cable Kit 
$44.95. Complete satellite kit $49.95. Add SS.OO 
shipping. Free brochure. No New York sales. 
Summit RS, Box 469, Bronx. NY 10465. 

BUILD OR buy aasembled, four digit SWR & 
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BUILD YOUR own neighborhood radio station 
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TEST AIDS tor testing units In FULL SERVIVE 
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BUILD — FIVE-digit, ohms, capacitance, fre- 
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$9.95, Bagnall Electronics, 179 May, Fairfield, CT 
06430. 

ONE CHIP DOES IT ALL, Illustrated guide to 
understanding and designing circuits utilizing the 
Motorola 6eHC11. $5.00. fRI-DEA, Box 6600, 
Macon, GA 31208. 

SIMPLE SECURITY, learn the basics of alarm 
design. Tested plans can tie adapted for unlimited 
uses. Includes input conditioning, timer basics, 
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VI D EOCi P H E R II /satel I i te/scan ner/cable/ama- 
teur/ceilular/repair rranuals. modification ixxiks, 
software. Catalog ~ $3.00. TELECODE, PO Box 
6426-SH, Yuma, AZ 85366-642*, 



KENWOOD & ICOM service bulletins. 175 + 
pages covering all models. $39.95. Catalog — 
$3,00. CODs (602) 782-2316 / FAX (602) 
343-2141. TELECODE, Box 6426-SH, Yuma, AZ 
85366-e426, 

DESCRAMBLER KITS. Complete cable kit 
$44,95, Complete sateliite kit $49.95. Add $5.00 
shipping. Free brochure. No New York sales. 
Summit RS, Box 489. Bronx. NY 10465. 

DIGITAL COMMSS ~ A unique handhekl de- 
vice ttiat detects all eight compass headings. Re< 
suits displaced by the lighting o( the appropriate 
LED, Ktt contains compass sensor^ PCB (2X3.5 
in); LED"s; resitors S detailed iristructions. $26,50 
Suncoast Technologies. PO Box 583SRE, Spring 
Hill, FL 34606, 

BUILD A TV and radio jammer! Ultra simple 
(parts under $10.00),j{Aat effective. Great joke for 
that friend with a new TV or neighbor with tha loud 
stereo! Plans only $4.00. W.C.N., 3283 
Belvedere, Riverside, CA 92507. 

LINE NOISE eliminator. Simple plans tor mod- 
ems. Kills static. Build for $10,00 of Radio Shack 
parts. Plans only $5,00. K&A Enterprise, Box 111. 
Hampden-Sydney, VA 23943. 

BUILD FUN electronic games with LEl>s and sim- 
ple digital ICs. Book has plans for over 20 games. 
Send $9.95 + $2.00 S&H Omegatronics. PO Box 
911, Bloomingdale, IL 50108. 

SECURITY SYSTEM schematics for eight zone 
entry exit delay controller with fire and panic k>ops 
$15.00. Plans to modify inexpensive, readily avail- 
able device Into passive Infrared alarm system 
compatible detector $5,00, Soth $17,50, V-Tiro- 
nica. Box 620, Rte 3, Kerhonkson, NY 12446, 

BUILD OR buy assembled, complete lie detector. 
Only $28.75 from Javier E, Baez Electronics, PO 
Box3151,SanLuis,AZ8 5349, Write us, right now, 

UFO BUSTERI Novel vehicle-based circuit 
probes mysterious energy fields that may interfere 

with engines, lights. Solid theory, compact, easy- 
building. Plans & data. $19,95 postpaid. Exciting 
electronics! 'Stack, Box 365. Rooseveltown. NY 
13663, 

PRACTICAL FUEL SAVINGS for carbureted ve- 
hicles. Phenomenal results possible, easily and 
Inexpensively Free vacation offer to first 500 cus- 
tomers. 1 (800) 747-9053. 

LED POSTER Art. Add an eye catching lighted 
effect to any poster. Great conversation piece or 
sell for profit. Complete illustrated instructions 
with Radio Shack parts list. $6,95, S, Sestito. Box 
378RE, Eimstord. NY 10523, 

PRINTED CIRCUIT BOARDS MADE. Single 
quantity, tow quantity. Low prices. Single sided 
boards only. Send SASE tor complete informa- 
tion. J. Morrow, 500 Ken Maril Road, Ames, lA 
50010. 

STAINLESS STEEL scffiws, nuts, washers. As- 
sorted kits. Free cataksg. Rusty Bolt, Box 706S, 
North Attlefaoro, MA 02761. 

WIRELESS GUITAR transmission system. BuikJ 
your own for $39.95! ULTRA QUIET FM DESIGN. 
Features built-in switchable distortion effect! Kit 
includes PCB and ALL electronic components. 
Order TOLL FREE 24 hours: RadloActlve 
TRANSMISSIONS, 1 (300) 263.9221 Ext,2587, 

FASCINATING ELECTRONIC DEVICES! KITS 
— STUN DAZER $44,95! SUPER FM OR AM 
TRANSMITTER $29.95! PHONE BUG $19,95! 
BUG DETECTOR $39,95! RF OH ACOUSTIC 
BUG JAMMER $34,95! SUPER SPY MICRO- 
PHONE $34951 VOICE DISGUISER $39,951 
TESLA PHASOR GUN $79,95! SUPER BAT. 
TERYLESS RADIO/ POWER SUPPLY $29,951 
UNIVERSAL IC TESTER $49,95! LASER 
RADAR DETECTOR $39.95! CATALOG $4.00! 
PLEASE ADD 10% SHIPPING. ORDERS OVER 
$100.00 SHIPPED FREE! QUANTUM RE- 
SEARCH. 17919-77 AVE., EDMONTON, AB T5T 
2S1. 

NI-CAD ZAPPEH can rejuvenate those unre- 
chargeable Nl-CAD batteries. Instructions, sche- 
matic and parts list to construct the NI-CAD 
Zapper: $5.00. TEMTRONIX. Dept. RS992. 3605 
Broken Arrow, Coeur d'Alene, ID 83814. 



CELLULAfl hackers bible Theory — hacks - 
modifications — $53.95. TELECODE, PO Bo* 
6426-SH. Yuma. A2 85366.6426, 

FM STEREO BROADCASTER kit. This kit out- 
periorms the competilton. Transmitter will broad- 
cast any audio signal from a CD player. VCR, or 
cassette player to FM stereo radios throughout 
your home and yard. All the complex circuitry is In 
the unique BA1404 integrated circuit. TunaWa 
across ihe FM band, runs on 1.5 to 12 volts DC. 
Complete kit of PC board and components for 
$24.(50. TENTRONIX, Dept. HS992, 3605 Broken 
Arrow, Coeur d'Alene, ID 63614. 



COMPUTER HARDWARE 

IBM PC and laptops video digitizer, connects to 
cameracorder, 640 by 480 resdutksn. 256 gray 
levels $39.98. Demo disk $3.00, information 
$1,00, Colorburst. Box 3091, Nashua, NH 03061, 
Phone (603) 891-1588. 

386/486 CPU heat sinks, patented, best perfor- 
mance anywhere, u-lnstall. Send $18.00/1, 
$30,00/2, C, NOGAL, Box 2123-re, Buffalo, NY 

14240, __^^_^__^__^ 

PC PARTS Mbs, disk drives, hard drives ate. 
Overstocks, reconditioned. Muitiwatt Systems, 
Box 1147, Buriington, MA 01803, (617)229-9798, 

UNIVERSAL MICROPROCESSOR SIM- 
ULATOR/DEBUGGER V2.0 each set $90,00, Foi 
use with PC and compatibles. Simulates the Z80, 
8085, 8051, 6800. 6801. 6805, 6809. 6811, 6303 
and 6502 and 65C02, Features assembler, dis- 
assembler, source-tevet debuggar. Accepts tiin- 
ary and Intel hex formats. Displays registeirs and 
flags after execution. Response from terminal can 
be saved to a file. Includes batch tile capability 
and buit-in demonstration. Additional sets are 
$50.00 each, The ROMY-8 EPROM EMULATOR 
works with simulator. Emulates EPROMs 
27f6-27256. Code-patching with line assembler 
Monitors address bus. Loads 32K of code in 2C 
seconds (PC/AT 12 MHz). 90 day warranty. Savea 
you money only $1 55.00 (complete with one set ol 
CPU simulator). J&M Softurare Hardware De- 
sign, Inc., 83 Seaman Road, West Orange, Hi 
07052. Tel: (201) 325-1892. RW: (201 ) 736-4567. 

INEXPENSIVE SINGLE BOARD COMPUTERS 

— An 80S1 based SBC (assembled) with RS-23S 
circuitry; socketed EPROM; large breadboarc 
area; 128 byte memory and 14 T/0 ports. Free 
programming software with each order. $38.0C 
(plus $2,75 s/h). Suncoast Technologies, PO Bo> 
5835RE, Spring Hill, FL 34606, 

COMPUTER COfrTROLLED security systerr 
for home or business. Uses IBM PC or CW 
computer. Includes infrared, vartous senson 
and software. State of the Art security at i 
reasonal>le cost. Send for free brochur« 
WMck Products, 8132 Firestone #119, DowfMV 
CA 90241. 

LEARN MICRO-CONTROLLER programmlnj 
using new 80C32 CPU, program in ^sic-S2 o 
assembly language, the 80<^2 CPU card has i 
50 pin output header whk:)i will interface with you 
solderless breadboard, enabling you to desiqn tti< 
circuits that you want (ad/da, ke^jads, LjCu, pp 
output circuits, etc.). Send self addressed ikisi 
ness size envelop and $i,0O tor schematic, anc 
full details to J. Macswan, 8132 Firestone Bhfd. 
Suite 67, Downey, CA 90241. 



CABLE TV 



TV NOTCH FILTERS, BROCHURE $1,00 MICRC 
THlnc. BOX 63/6025, MARGATE, Fl 
33063.(305) 752-9202. 

TEST AIDS for testing units in FULL SERVtVl 

mode, Starcom Vll, $40,00; Starcom VI, $30.0C 
Starcom DPBB. $50,00: Pioneer, $75,00; Tocor 
VIP 5503''5507, $25,00: S.A. call; Zenith, $25.0C 
N.E. ENGINEERING [617) 770.3630. 

TOCOM CABLE CONVERTERS Model 5504/" 
B. Clean condition, but sold as is with no remote 
Discounted to ONLY $24.95 each. CALL 1 (8« 
TED-HEXS. 



60A76 



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Pocket-Sized Ku-Band LNB, 

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Perestroika Fallout...Soviet Science Collector's Item! 

ntHmanht E/rip^rat vumblnol Ea^af y<04jogsc4ntl«i3^6*ingtrvnadf«D>tn*wwerU«nlBil W4te4fc«4<<irt«{^QlChaQh«P^igw9rid>canabbhnglo)KiutriaaaLjriqH*JMi 

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V 



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4 



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Teeny Tiny Tuner Modules 

Th* umuuAl iam U MI u a MITSUMI CRTV9-ACHF (3 CISilind | 
RavaiH C«M(W- Vw OFpsOa of 1 tuiw - Iffiiit IF lignal (4S 75 MHz) 
oiTMilKluona Df SS CATV ilgralfixqwrniai (K 2SI«4iliiM7.2MHD 
akdad by vofcav* ^iput lo varftdor dloda (3.2iVI>C). R«qUlr*fl I 
.12,4SV0C- Ptuut. Sp*c ShHt a ai«l< Dkgram hdudKJ. Body 
Maaina 3.7Flc2^(.75-. Uwf uf l9r Amawv TV 7 H*m»7 I 

HSC 013120 $14.95 ■ i'"*.'**^" 

Han n a Mb moduia that you wont (Wj ]unywti«r» okH) Thii dny (4niy 
i'x T TS'i .5^ PC mount pacKaga t a varicto<r tunad FMlunarl Wad* 
by Tolto {Modal ffTWCHra*) For Lwofltht PC FFrf SLfcani** adapto« 
■t rtght. Uaat fl - 12VDC. tunat rro«n as.3 Co 10«.1 lA-d from 75 «t¥irt 
•Aiaort* ir^U, h»a 10.7 luKt EF AL)i)cut w«h V« ihj«hi tw Dwtto* 
fiwSiw^ b mnng c^uitiy. Wa provxfa a Ktwruo; of a au(oaat ' 
aoptwitton ifwwng p*icut of tfw moduli wiin rtLitfd Cuning c*cu«. 

HSC*13101 $4.95 ea. or W/S39.95 

Broadcast FM Antennas 

K Wln*gwd SR-I TO0 YagJ-lyp* FM^VHF Antanni. Smal mait-mount intama 

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cant laa any r«uon not lv um it vjtdoort £2.^ boom, tongtil 
a4arrw«it«r. hwaa tntatndadfor tfwdala racafvarsair^ 
kift%V*r*<3ap69naraaB, >Jlw4of coLtTfia wofkVtafof FM 
Broadfaj^ rac»pOon with ymjf ita™o, is watt » VHRTV 
r*c«pi>on'l Maw wth auarnbiy md rmunUng instrudt^m, 

HSCM13086 $19.95 

B. E>l9a4**nlaiini(rKtthKMn). TyphAl30&«hmalar«aFM-lyp«4po4aantt(yiawUitKA. j 
h balun ^ TS^hm ooax. plua a ■^■fooc ccax cabla wtHi F<«itfHelon. Worh* gn«l wfh | 
FM aanoa. VHF TVi. or Iha unM at rIsMI 

HSC $13087 $1.35ea. or 1W$15.00 

C. FU "Butb.r Ducky" Anianna ..irli>ng»Wi f*«t Joint on H^^^ 
moia«ngboK. 7S4hiTic4txf4ibl«(SfQ«Ow<riT'oomactor. Coud p 




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>jrtta...AndRgiMcV)ihwy«iwritfff*9yauw<hid^€llOMVal«^i*idpli«| Wthavacoma 

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A "PIN-DaaJt'^lBhtFUSubca/HwHocaJvirBowC Madlby 
Indacyt {vnukv to MuMnbon). Fm banglh XT ityia beam hn 
iTiUdtd box wfln FM tur*r ifraquaocy »ltctad by aoRvora), 
piggybadt board vAh 4«»«r I MCat ortMi CY2W1'<. Comaft 
iA«i dlpok anUnna tM« "B" K lafC) and hvo d«li»aat, ona 
marKad *San^ and ooa ifiaric»d ■R»eawa\ TH% ml* vKandad 
Co b* part of m FM ciJKarnar»iiliKrt)(faKi Viatworic'' br««ndk^ 
vd r*o«vtng mataiQaa, Haa tnddata iny^whara m th* « urKryl 
A hat^if's boninii wih (dapanflng on rvmicn} NVfiRWiri, 
FhUX23l. NSCfiDO, ayrtw tte wj FM tuw. ftF Pwts, ale I 

HSCM13084 $24.95 

&. -Pm4flBJr'RH;|«vfrBA-n7A.atoomid«t]ylndaay«. T>it» 
w*a part of thar-plH- ty«*ni, ml you war* Hfipoattd 10 ba abla 
to naoaFva E-rrui, unaeandHt.v^ fM S^EcarrUk Mh |uat ihia 
box. an antanna (Indudad) and a printcri Or it Mutd b* bookad 
upto tconputwvtaparaAtlpwt. B«k h» lumaric hajrp^d on 
t«p. pan o4rnK*9fi on back for po<A<ar, pf^^i, ^tTputaf and 
utatvu. Hedakaaati;a44^vif*«lnnOfiO,iutt^''K*'varurdt 
d^oi* amfma md powar w^pr^. 

HSC #13085 $24.95 

C. Saltinia Data n*calv*r 5T'1S9, by InSMyf. Ejatfraa/ 
almia; la 'C ifiova. but vaiy dfafwt kH4da . unawaa daa^iad 
H ba bodud u a KnaldWi anannt and LNB (not kKtjM< aid 
M doifl hava inyl) lor t^amt itofHen et ikta and E-inal. 
Pwiar Supply pn ivMad. Maiy Wimi n g pnn Hatta, tKludhg 
;-M, HVSRAM . RF LJrMr ptjtl, tOC31 . SMn SMI SC7-IOat, 
Nghfraquancy varactoJtunOf.atc. Exp«'imonE*('i dtllgM 

HSQIf13100 $24.95 




ba tdad m piOiCa of 'D" abova 

HSC # 13038 



$4.95 



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Macintosh Serial Cable Set 

Ttiree piece setof Mac accessory cables consists at one RJ1 1 to DB9S caWe, I 
one flJ1 1 to Mirv-OIN SM caUe. and one DB9M to Da2SF adaptor. Both cabiea 
are six feet lorq and tiave noise suppressor chokes, and all items are an | 
attractive olf-wbite cokir. Large quantity purchase means s spadal knv prtcal 

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luivt Quaido^ about your OKl*r, pMaaa ol Cuctotn*' Sarvka H (40«) 732-ig£4 M-F 9AM la SPM POT 



CIRCLE 244 OH FREE INFORMA-nDN CARD 



60A77 







Connect Muscle Wires" to a bonery or olfier power 
source and watch them tonlwct in iBnglb up lo five 
percentl Remove power, and Ihey relox ond ore 
reotiy for millions more cycles. 

Qeole direct linear action without heavy gears, 
coib, or motors. Use Muscle Wires in robots, models, 
planes, railroods ~ onywheie you need small, strong 
ali-electric motion. 



-^Q&A 



What Are Masth Wins? 

Muscle Wires are highly processed strands of 
a nickel-titanium alloy called nitinoL At room 
temperature they are easily stretched by up to 
5% of their length. When conducting an electric 
cuiTEni [hey heat and return so iheir original 
'unstretched" shape with a force thousands of 
times tlieir own weight. 

Mow strong an KlMsdk Wtesf 

The force a wire pulls with varies with size, 
from 35 to 330 grams. For more strength, use 
several wires in parallel 

How fast ten Afvsdi V/k«s KtlvoH? 

They contract as fast as they ate heated - as 
quickly as I'lOOO of a second. To relax, the 
wire must cool again. Rates of many cycles per 
second are possible with active cooling. 




How madi power do Mvsde Wires need? 

Power varies wjili wire diameter, length, and 
surrounding conditions. At i^rani temperature 
typical cunrents range from 50 to 400 mA. 
Power leveb can be hi^er, but once the wire 
has fully shoitened, power should be reduced 
to prevent overheating. 

What an Ae admitages of Mosde Wires? 

Muscle Wires have many advantages over 
molors or solenoids inctuding small size, light 
weight, low power, very tiigh strength-to-weight 
ratio, precise control. AC or E>C activation, long 
life and direct linear action! 

All these topics plus 14 great ptojects are 
covered in detail in our book. Ofi^ Today/ 



Get our new 96 page Book aitd Muscle Wire 
Sample Kit. It has 20 cm oF 50 ^ro, and 40 cm eoch 
of 100 and 150 {.imdiotneler Muscle Wres (1 tneler 
total), plus crimps & instructions - everything you 
needto^e^mofjngtoday! 



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DESCRAMBLING, NEW secret manual. Build 
your own desoramblers for cable and subscript 
tlon TV. Instructions, schematits for SSAVi, gated 
sync, Sinewave, (HBO, Cinemax, Showtime, 
tJHF, Adult) $12.95, $2.00 postage, 
CABLETRONICS, Box 30502R, Bethesda, MD 

aOS24. __^^ 

"BULLET" BUSTER. Protect your cable box 
against Ihe infamous cable "bullet." Tiie "Bullet" 
Buster acts as an electronic shield. Installs in-line 
in seconds. Don't wait until its too late! $19.95 plus 
$3,00 S&H. ELECTROMAN, PO Box 24474, New 
gleans, U 70164. 

CABLE ENCODERS SA Dropfield like new 
$1 100.00, Jerrold DSE $1000.00. Jerrold SSE 400 
converters, SA 8510 S50.00, raw DRZ DIC 
$65.00. Call Stan (414) 554-8618 Fone/Fax 3-8 
est. Buying inventory. 

CetV CONVERTERS: Jerrold 400 450 DJC: 
$59.00, JSX JRX liilSSB $13,00, SB-3 $25,00, 
Oalc RKDI/, RTC-56 $69.00, Hamlin CH-60003M 
$59.00. Starcom 6 $150.00. Other brands in 
stock. Minimum 10 lots. For dealers only, (405) 

685-2046. ___^^_ 

irS HERE at last — the new Zenith super chip I 
This one works or you get your money back. Irs 
the all new ZZ chip. Easy to install, even Idiots can 
work with this one! Call for prices on one. or a 
quantity — you'll be surprised how inexpensive 
the ZZ can be. (305) 425-4376. 

TOCOM 5503 "Turn on" module, \tetch all chan- 
nels. Complete simple instructions, schematic. 
$25.00 ea. Two for $39,00, ti/(lke. Box 743, 
Oldsmar FL 34677, 



MISCELLANEOUS 
ELECTRONICS WANTED 

SURPLUS PHOTOFACTS WANTED. Many num- 
bers, all quantities. Loeb, 414 Chestnut Lane, 
East Meadow, NY 11554. (516) 481-4360, 



SATELLITE EQUIPMENT 

VIDEOCIPHER II, descrambllng manuaL Scha- 
nnatics, video, and audio. Explains DES, Eprom, 
CloneMaster, 3Musketeer, Pay-per-view (HBO, 
Cine max. Showtime, Adult, etc.) $16.95, $2,00 
postage. Schematics for Videocypher Pius, 
$20,00, Schematics for Videocypher 032, $15,00, 
Collection of software to copy and alter Epram 
codes, $25.00. CABLETRONICS, Box 30502R, 
Bethesda, MD 20824. 



REPAIRS-SERVICES 

CREATIVE ELECTRONIC technician looking for 
R&D work that can be done at home. Analog or 
digital circuits. D. Cousins, 13 Tioga St., Newton 
Fa3is, OH 44444. 

iLEARN TO repair copiers 1 Order: Copier Doc- 
tor, an introductory text on copier repair Plus; 
access to toner, developer, parts, $12,95 plus 
$2,50 S&H, Coastal Technical Products, 317 
Leeds Gate Rd„ Savannah, GA 31406, 



TEST EQUIPMENT 

INTRODUCING: PROBE ANALYZER, 100 mil- 
lion sample per second, 64 K deep single node 
(ogle analyzer, in convenient hand held probe. 
Uses PCs printer port, multiple waveforms dis- 
played on screen for fast troubleshooting. Cur- 
sors, zoom, disk store, frequency measurement, 
trigger, and more, $200.00, ROCKY TEST, 333 S, 
Stale Street. Suite 214, Lake Oswego. OR 97034. 
Phona information (503) 638-3840. 

TOPMARK'S DEVICES: Frequency syn- 
Ihesizers, 0,5-3GHZ, octave bands. 10-200KHZ 
steps, 4MS lockup lime, $500.00 + . Source lock- 
ing versions, $400.00 + . VCOs, amplifiers, 
$100.00 + ■ Topmark (312) 262-3162. 

DISTORTION ANALYZER In Radio-Electronics 
12-91 article measures 0.005% THD. 90db notch 
at 1kHz. Built-in calibrator. Uses your DVM for 
measurement. Only nine ICs. Silkscreened front 
panel and finished printed circuit board: $28.00, 
INSTBUMEX, Box 490, Blue Bell, PA 19422, 



VCO'S & Synthesizers: 1-2GHZ and 2-3GH 
VCOs and synthesizers, todbm output, excellei 
phase noise. VCO's $250.00, synthesize! 
$550.00. Higher frequency versions available I 
20000MHZ. Orders only Topmark (312) 262-3161 



BUSINESS OPPORTUNITIES 

EASY WORK! Excellent pay I Assemble produci 
at home. Call loll free 1 (800) 467-5566 ext. 1106£ 

EARN GREAT $$S WITH YOUR COMPUTEF 
Work at homel PROVEN SUCCESS! Send $1,0 
for details to: Owen, 5900 Yorkwood Rd., Baltc 
MD 21239. 

A GREAT idea Is a fenible Ihlng to waste! Heceh 
income for your ideas with rnlntmum outlay. Leai 
about Sharefare. $1.00, SASE, Nlcknap, Suit 
297, CN 1907. Wall, NJ 07719. 



EDUCATION 



GET YOUR "FCC Comnrarcla! General Rad 
otelephone License," Electronics home stud 
Fast, inexpensive! Free details. Command Pn 
ductions, D-225, Box 2824. San Francisco, C 
94126-2824. 

TELEPHONE HOME study course. Profession 
certificalion. Association of Certified Telephor 
Technicians, Route 3, Box 98, Ellington. M 
63638. 

SHARPEN YOUR electronic skills with the Bas 
Electronic Simulations and Problems compuli 
program for the PC-MSDOS. Perfect to help yc 
prepare for your GET test. Satisfaction guarai 
teed, $29.95 plus $3,00 S&H. EES-REBEOI, PQ 
1391, Lubbock. TX 79408. 



PUBLICATIONS 



HIGH VACUUM technique, physica! electronic 
and nslated topics tor the serious amateur expei 
menter Subscribe to the Bell Jar, a new quarter 
journal. SASE for further information or S15.00 p 
year (US addresses) payable lo Steve Hansen, J 
Windsor Drive. Amherst, NH 03031. 



COMPONENTS 



BATTERIES GALORE for all your electronic pre 
eels and household needs. Free catalog, PO Be 
9932, Maplewood, MN 55109. Or phone 1 (801 
657-5929. 

ELECTRONIC SURPLUS catalog. Send SASE 
Electrical and Metal Recovery, 4578 Cole Re 
Syracuse, NY 13215. 

STAINLESS STEEL screws, nuts, washers, A 
sorted kits. Free catalog. Rusty Bolt, Box 7081 
North Attleixtro, MA 02761. „^_„ 

SOLDEHLESS BREADBOARDS 840 tie poin 
with versatile magnetic mounting system $6.£ 
add $2,00 S&H, Magnetic mounted digital moi 
tjies in wired and kit fonri from $4.00. Send $1.C 
for list. Omegatronics, PO Box 91 1 , Bkximingdal 
IL 60108. 



COMPUTER SOFTWARE 

COMMODORE 64 Ham programs, 6 disk side 
over 200 amateur programs $16.95. 29 cei 
st^np gets unusual software catalog of utililie 
games, and British disks. Home-Spun Sottwan 
Box 1064-R, Estero, FL 33928. 

VIRUSFREE SHAREWARE,^9 MEGABYTE 
$29.00. add $29 .00.' 29MB increment up to 5f 
MEGABYTES. Include $3.00 shipping pi 
100MS: 1 (800) 876-8496. Visa-MC. SHAHI 
NET, POB 12368, Oklahoma City, OK 73157, 

SO-MEGABYTES programming SRC/utlllties. ( 
ASM'PAS/Basic 550.00. $3.00 shipping: 241 
order.'! nfo.fax: 1 (800) 676-8496, Visa-M( 
SHARE-NET, POB 12368, Oklahoma City, 
73157. 

SHAREWARE! THOUSANDS OF IBM PR( 
GRAMS. S3.00 S&H for 2 disks full plus cataic 
disk. American Software, PO Box 509, Suite M' 
Roseville, Ml 46066-0509, 



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IBM COMPUTER PROGRAMS $1.93! Windows, 
business, home, games, art, fonts UNCONDI- 
TIONALLY GUARANTEED. Free catalog. 1 (800) 
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$3,00 Each. Thousands of IBM programs. CAD. 
electronics, programming, etc. Free catalog on 
disk. BAC Marketing, 505 Soulh Beverly Dnve, 
Suite 1142, Beverly Hills. CA 90212-3fl3B. 

IBM SOFTWARE for hams, technicians, and stu- 
dents. Also quality wire antennas for hams and 
SWL. Send 29 cent stamp to Homebrew Bee- 
tronics, PO Box 8294. Trenton. fvU 086S0. 

EE PLUS other engineering P.D. Shareware. 5,25 
IBMtormal.Sendforiisting. Special — SI . 60 for a 
disk full ot engineering softvrare. No S & H. 
ASBSott, Room 2708. 1350 Siirtti Ave., New York, 
NY 10019. 

FREE DISKS!! and, FREE PROGRAMS!! Our 

catalog contains over 20O0 of the newest share- 
wans programs available! Over 200 hard to find 
rentals, and our list ol electronic printing bargains, 
all on 360K disk!! Plus, clip this ad and send it to us 
and you will also receive an IBM compatible game 
program, and ulilily program, (we choose pro- 
grams) plus specials of the month on a second 
disk fteelt Just send $3.00 shipping {refund able) 
for 360K disks or S3.50 shipping (refundable) for 
720K disk. S13.00 gets you a beautiful 10 disk 
capacity lloppi/ disk holder, (our choice of color) 
plus 10 of our highest quality formatted 360K disks 
wliich include sleeves labels & tabs. Plus all the 
above witti $3.00 being refundable!! Same deal 
with 720K diskettes instead of 360K disks, only 
$15.50 with $3,50 being refundable!! BEACH 
RADIO, Dept. RE., PO Box 548, Boston, MA 
02112-0548. 

PROGRAM THE 68HC11 in Basic with this PO 
compatible disk from Motorola. Contains the 
BASIC11 intetpreter, Buffato Monitor, sample pro- 
gram and more. Only S7.00 from Suncoast Tech- 
nologies, PO B0X5335RE, Spring Hill, FL 34606. 



LEARN ELECTRONICS Why spend thousands 
of dollars on an electronic course when you can 
learn electron res on your MSDOS-PC compatible 
computer? We offer modem Computer Aided liv 
struGtion programs to help you achieve your goal. 
Lessons are shipped every other month until you 
complete the course. Each lesson costs only 
S29.95 plus S3 -00 S&H Order lesson One today 
and receive a FREE safety program. Specify disk 
size. Satisfaction guaranteed. EE5-RES06, POB 
1391,Lubbock. TX. 7940S. 

CROSS PART DATABASE SOFTWARE: 
Crosses common electronic component part 
numbers to SYLVANIA and PHILIPS replace- 
ments. Contains approximately 3t.0O0 part num- 
bers. 3-3 1 2 inch disks, CROSS PART IDENTIFY 
SOFTWARE: Crosses prefixes ot electronic com- 
ponent part numbers to their manufacturer, 
DATABASE — $38,00 IDENTIFY — $10.00 MC, 
Visa, check, money orders Kx»pted. CPS SOFT- 
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363-4330. 

PC BOARD and schematic design software for 
the IBM PC'Compatible. Create professional PCB 
layouts (with autorouting — requires EGA) and 
electronics schematics (CGA) with these inex- 
pensive shareware programs. Both (or $7.00. 
SUNCOAST TECHNOLOGIES, PO Box 5835RE, 
Spring Hill, FL 34606. 

PROGRAM THE 8051 microcontroller in Basic 
with this PC.compatible shareware collection. 
Disk contains Editor, Basic Compiler, Assembler, 
Disassembler, Procomm plus 3 surprise pro- 
grams. Only $7.00 from SUNCOAST TECH- 
NOLOGIES, PO Box 5835RE, Spring Hill, FL 

34606. 

WJ51 TINY Baste interpreter. A program that re- 
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8051 microcontroller with simple Basic com- 
mands. Disk contains the Tiny Basic program, 
EditOf. Program Converters, detailed instmclions 
and schematics. Only $10.00. Suncoast Tech- 
nologies, PO Box Se3SRE, Spring Hill, FL 34606. 



ANTIQUE ELECTRONICS 

TUBES, PARTS (old stock from closed or bani 
rupl Radio-TV stores). Extensive listings in 1 
page illustrated catalog: $2.00. Don Diers. 427 
North 50 Street #SC4, Milwaukee, \ft 
53216-1313. 



AUDIO-VIDEO-LASERS 

IBM PC and laptops video digitizer, connecte I 
cameraeordor, 640 by 4B0 resolution. 256 grE 
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ree 5000-ohm resistors in se- 
;s between the supply voltage 
id ground so that one-third of 
le supply voltage is developed 
;ross each resistor. The inter- 
al flip-flop circuit provides a 
^finite "on" or "off response, 
s timing intervals are indepen- 
ent of the supply voltage. 
The 555 has two basic operat- 
ng modes: monostable (one- 
hot — a single pulse is emitted), 
jid astable (a stream of output 
luises is generated). In the 
nonostable mode when func- 
ioning as timers, time is pre- 
;isely controlled by the external 
RC networlc. In that mode the 
555 produces output pulses 
with rise and fail times mea- 
sured in microseconds. 

In the astable mode, the 555 
can be an oscillator. It can main- 
tain an accurately controlled 
free-running frequency and 
duty cycle with only two exter- 
nal resistors and one capacitor. 
In either monostable or astable 
modes, timing accuracy is es- 
sentially independent of varia- 
tions in supply voltage or 
ambient temperature. The de- 
vice can be triggered and reset 
on falling waveforms. 

Typical applications for the 
555 include precision and se- 
quential timing, pulse genera- 
tion, pulse-width and pulse- 
position modulation, and linear 
ramp generation. Moreover, it 
can directly drive loads such as 
relays, solenoids, low-power 
lamps, and high-impedance 
speakers. 
The 555 is packaged in plas- 



tic and metal DIP's and 8-pln 
metal cans for operation in the 
commercial temperature range 
of "C to -I- 70°C. Some plastic 
DlPs can operate in the -40°C to 
-l-85°C extended temperature 
range. 

Alternate-sourced 555 's can 
usually be identified by the in- 
clusion of the numbers 55 or 
555 in their designations. Ex- 
amples include Harris' CA555, 
Motorola's MC1455, and Nation- 
al Semiconductors' LM555C, 
Other sources include Exar, 
Goldstar, Raytheon, Samsung, 
SGS-Thomson, and Sharp Elec- 
tronics, CMOS versions of the 
555, such aslfexas Instruments' 
TLC555 are also available. In 
addition to their low power con- 
sumption compared to stan- 
dard 555's, their outputs are 
compatible with CMOS as well 
as TTL. 

T^ble 1 presents some basic 
electrlcEil characteristics for the 
555. The 556 is housed in a 14- 
pin DIP package but the block 
diagram of each circuit is iden- 
tical to that of the 555 shown in 
Fig. 1. The 556 is also alternate- 
sourced by many of the same 
firms that offer the 555. Exam- 
ples are Motorola's MC3556 and 
Tfexas Instruments' TLC7556. 

How the 555 works. 

Figure 2 is a representative 
circuit schematic for the 555, It 
contains 21 transistors, 4 di- 
odes, and 15 resistors. The volt- 
age divider consisting of three 
SOOO-obm resistors (shown in 
Fig. 1) appears to the right of 



TABLE 1— ELECTRICAL CHAR ACT ER!STICS 



Characteristics 


Symbol 


Min. 


TVP- 


Max. 


Unit 


DC Supply Voltage 


Vcc 


4.5 


— 


16 


V 


DC Supply Current (V-f =5V) 


"cc 


— 


3 


6 


mA 


(V-h=5V) 




— 


10 


15 


mA 


Power Dissipation 




— 


— 


600 


mW 


Ttireshold Voltage 


V,h 


— 


% 


— 


V 


Trigger Voltage {V-i- =5V) 


Vt 


— 


1.67 


— 


V 


(V-H=15V) 




— 


5 


— 


V 


Reset Voliage 


Vr 


0.4 


0.7 


1.0 


V 


Reset Current 


<R 


— 


0.1 


— ■ 


mA 


Timing Error (Monostable) 




— 


1 


— 


% 


Frequency Drift with 












Temperature 




— 


50 


— 


ppnv^C 


Drift with Supply Voltage 




— 


0.1 


— 


"/W 


Output Rise Time 


tr 


— 


100 


— 


ns 


Output Fall Time 


V 


— 


100 


— 


ns 



QIO in the trigger comparator. It 
applies one- third of the supply 
voltage to the non-inverting in- 
put terminal of the trigger com- 
parator and two-thirds of the 
supply voltage to the inverting 
input of the IC's threshold com- 
parator. 

The output of the two com- 
parators controls the R-S flip- 
fiop, which in turn controls the 
states of the complementary 
output stage and the slave tran- 
sistor Q6. The flip-flop's state 
can also be set by signals at 
RESET pin 4. 

When organized as a mono- 
stable timer, the trigger pin 2 
is held high by external resistor 
R.^ in series with the DC supply 
voltage. Under that condition, 
Q6 is saturated, shorting exter- 
nal timing capacitor C,-, to 
ground, and output pin 3 is 
driven low. Timer action is 
started by applying a negative- 
going trigger pulse to pin 2. As 
this pulse falls below one-third 
of the DC supply voltage, the 
output of the trigger com- 
parator changes state. That 
causes the R-S flip-flop to 
switch, turning Q6 off, and 
driving output pin 3 high. 

As Q6 turns off, the short Is 
removed from the external ca- 
pacitor Cp. The capacitor 
charges through the external 
resistor Rq until the voltage 
across C^ rises to two-thirds of 
the supply voltage. Then the 
threshold comparator changes 
state and switches the R-S flip- 
flop back to its original state, 
turning Q6 "on" and rapidly dis- 
charging Cp. At the same time, 
OUTPUT pin 3 reverts to its low 
state. The timing cycle is then 
complete. 

A characteristic of the 555 is 
that, once triggered, it cannot 
respond to additional triggering 
until the timing sequence is 
complete. However, the se- 
quence can be aborted at any 
time by feeding a negative-going 
pulse to RESET pin 4. 

The output pulse is a square 
wave whose duration (time de- 
lay) depends on the values of R 
and C. The formula for this is: 
tp (time delay) = 1.1 (value of R 
X value of C) 

Simply stated, time delay is 
directly proportional to the 



M 

^ 



? 



m 

CD 



I 
I 

4!! 
I 

o 

Z 




FIG. 2— REPRESENTATIVE CIRCUIT SCHEMATIC FOR A 555 timer with external re- 
sistive and capacitjve components. 



wr 






10 

C 

LLI 

r 

< 

o 
0.1 

1 
















/ 




/ 




/ 




/ 


^i 














/ 




/ 




/ 




y 


/ 












/ 




/ 




/ 




y 


/ 


/ 










/ 




/ 




/ 




/ 


/ 


/ 


/ 








r 




r 




f 




f> 


/ 


f 


r 








/ 




/ 




/ 




/ 


r 


/ 










/ 




/ 




/ 




/ 


r 


/ 










/\ 




/ 




/ 




/ 


^ 


/ 
















/ 




/ 




/ 




/ 














0.001 


/ 




/ 




/ 




/ 

















lO^s IOOms LOnw 10ms lOOms 

TIME DELAY (SECONDS) 



1.0 



10 



100 



FIG. 3— COMBINATIONS OF RESISTANCE AND CAPACITANCE yield a range of time 
delays. The trigger pulse width must be less than the timing period. 



64 



product of R and C. Figure 3 is a 
plot of time delay vs. resistance 
and capacitance based upon 
the time-delay formiila where t^ 
is in milliseconds, R is in thou- 
sands of ohms, and C is in mi- 
crofarads. Figure 3 gives a 



family of time delay cunres with 
variations in R^ and C^^ Delays 
from 10 microseconds to 100 
seconds can be obtained by se- 
lecting suitable values of low- 
leakage capacitors from 0.001 
|uiF to 100 p,F and resistors from 



1 thousand ohms to lO 

megohms. 

Figure 4-a is a simple fixed- 
period (approximately 50-sec- 
ond) manually-triggered time 
delay circuit, and Fig. 4-b 
shows the waveforms as they 
would appear on an os- 
cilloscope. The sequence of 
events in Fig. 4-b is initiated by 
grounding trigger pin 2 with 
momentary start switch SI, 
The coNTROE.- VOLTAGE pin 5 is 
decoupled by C2, and the out- 
put state can be determined by 
observing whether LEDl is il- 
luminated or not. A square out- 
put pulse (whose fixed-period is 
determined by Rl and CI) ap- 
pears at OUTPUT pin 3, while an 
exponential sawtooth (with the 
same period as the square wave) 
appears at discharge pin 7, 

The fixed-period output of the 
circuit in Fig. 4 can vary from 
1.1 to 120 seconds by making 
the changes shown in Fig. 5. 
Resistor Rl is replaced with a 
lOK fixed resistor and 1- 
megohm potentiometer R5 in 
series, as shown. A reset feature 
can be added by installing 
RESET switch S2, permitting 




■IG. 4 — FIXED-PERIOD TIMER produces a 50-second time delay {a}. The wave- 
orms at three pins are shown (6 + a). 



R5 
1MEG 

R1 : 

10K 



CI -J 
tOO(iF 



r^ 



R2 
Z2K 



ICl 
556 



CZ 
0.1 



R3 
22K 



-*+5T0 + 15V 



hfT 1 RESEt'Y start ^' y 



R4 

-iron 



Kedi 



OUTPUT 

p 



1 



FIG. 5— VARIABLE-PERIOD TIMER CtRCUtT with reset capability produces time de- 
lays from 1.1 to 120 seconds. 




FIG. 6— ALTERNATE METHODS FOR ENERGIZING a relay from the output of a 5S5. 



HEi 



♦ — f 



R1 
MEG 



R1 
100K 



J 

C3 
'lOjiF 



R2 
22K 



ICl 
555 



S3 



C2 ^ 



CI 
?f lOOnF 



4 ♦■ 



■+12V 



R3 
2ZX 



D1 

iN4tiin 



S2N0 , 

reset' 



u 



Ol, S1 NO 

stmit og ^ 

1H40al 



r6 



output 



RV1 
12V 
>60£1 



FIG. 7— TIMER WITH A RELAY OUTPUT provides time delays of 1.1 to 120 seconds. 



premature termination of the 
timing period. 

The 555 timer can drive non- 
inductive loads directly from 
pin 3 with currents as large as 
200 milliamperes. However, If 
the circuit contains an induc- 
tive relay load, either of the 
schematics shown in Fig. 6 ap- 
ply In Fig. 6-a, the relay RYl is 
normally off, but it goes on only 
when OUTPUT pin 3 goes high 
during the timing interval; in 
Fig. 6-b, RYl is normally on, but 
it turns off during the timing 
interval. Diode Dl in both cir- 
cuits protects the 555 against 
inductive-switching damage. 
The contacts of relay RYl can 
control external circuits. 

Figure 7 shows how a relay 
and a 555 can form a simple 1.1- 
to 120-second timer in two 
switch-selected decades. How- 
ever, the general -purpose cir- 
cuit has several drawbacks. 
First, it draws current continu- 
ously, even when the timer is 
off. Second, because of the wide 
tolerance variations in the elec- 
trolytic timing capacitors CI 
and C2, potentiometer R4 
needs two custom cahbrated 
scales. 

The schematic in Fig. 8 shows 
how to overcome these draw- 
backs. The RESET switch S2 and 
the set of relay contacts in paral- 
lel with the START switch SI, 
which are both normally open 
(N.O.) keep the circuit off so 
there is no current drain. The 
timing cycle is started by press- 
ing momentary pushbutton 
switch SI, which connects 
power to the 555. At the instant 
of 81 closure, C3 is fully dis- 
charged. It therefore sends a 
start pulse to trigger pin 2 
through R4 and Initiates a tim- 
ing cycle. 

As the timing cycle starts, RYl 
is energized. The contacts in 
parallel witli SI close and keep 
the 555 powered even when S2 
is released. At the end of the 
timing cycle RYl is de-energized 
and its contacts re-open, dis- 
connecting power from the 555 . 

The timing of the circuit in 
Fig. 8 is principally controlled 
by the values of resistor R] and 
potentiometer R5 , and either CI 
or 02, which are switch-se- 
lected by S3-a. Note, however. 



I 



m 



z 
t 

65 



Si 



I 

a 

to 

3E 

o 

Z 



UJ 
66 



that timing is also influenced by 
the setting of potentiometers 
R6 and R7. They are selected 
with switch S3-b and connected 
to CONTROL voltage pin 5 of the 
IC. Those potentiometers effec- 
tively shunt the internal voltage 
of the 555, thereby altering tim- 
ing periods. 

That feature allows the circuit 
to produce precise timing peri- 
ods even when capacitors with 
loose-tolerance values are in the 
circuit. It also allows a single 
calibrated timing scale to cover 
the two switch-selected timing 
ranges. 

To set up the Fig. 8 circuit, 
first set potentiometer R5 to its 
maximum value, set switch S3 
to position 1 and push start 
button SI. Then adjust potenti- 
ometer R6 for a precise period of 
10 seconds. Nejct, set 3 to posi- 
tion 2, push START switch SI, 
and adjust potentiometer R7 for 
a precise period of 100 seconds. 
With those adjustments com- 
plete, the timing scale can be 
calibrated over its full 100-sec- 
ond range. 

Timers for car lights 

Figure 9 is a circuit that auto- 
matically delays the turn-off of 
an automobile's headlights, per- 
mitting them to function as 
safety lights at night after the 
ignition switch is turned off. It 
is a useful circuit if you want 
your car's headlights to remain 
on for 50 seconds after you have 
parked, turned off the ignition, 
locked the doors, and walked 
away. The headlights will stay 
on long enough to illuminate 
your route until you can reach 
the safety of your home. The cir- 
cuit does not interfere with nor- 
mal headlight operation. 

When the car's ignition 
switch S2 is turned "on," RYl is 
energized (through diode D3) 
closing its contacts and con- 
necting the 12-volt battery to 
the 555 and headlights switch 
SI. In this state the headlights 
operate normally. However, be- 
cause both sides of capacitor C2 
are connected to the positive 
supply, it is fully discharged. 

When S2 is turned "off," the 
voltage across R3 goes to zero, 
de-energizing the relay. How- 
ever, at that time C3 applies a 



+ 1ZV 



R6 

10K 

(SET 

10 SEC 

MAX) 

In 



II—* 



R7 
10K 
(SET **^ 

100 SEC <■ 

MAX) 



HE 



(►— •■ 




^— ^ 



R5 

mid 



n 



R2 
?2K 



IC1 
5S5 



S3-a 



^°^^1 mt^f 



R4 
1K 



* S2 NO 

Riser 



♦ — o o- 



R3 
22K 



SI NO 
■ START 



D1 
-tN40ai 

W f 



D2 
1N4001 

. C2 
■O-lnF 



7^ 

^T^ OUTPUT 



^ 



Rn 



I 



FIG. 8— PRECISION (COMPENSATED) TIMER with a relay output has two ranges: 0,9 
to 10 seconds and 9 to 100 seconds. 




FIG, 9— HEADLIGHT TURNOFF CONTROL with automatic delay for automobiles. 

HEADLIGHTS „„ 3 
ORSPOTIIGHT -O'^F 

SWITCH 




(CHASSIS) 



FIG. ■tO-HEADLIGHT/SPOTLIGHT TURNOFF CONTROL for automobiles is manually 
actuated. 



negative-going trigger pulse to 
TRIGGER pin 2, initiating a 50- 
second timing cycle that applies 
current to the relay coil through 
Dl. 

Relay RYl's contacts remain 
closed for about 50 seconds 



after S2 is turned off, keeping 
the positive battery supply con- 
nected to SI during this period. 
That keeps the headlights on if 
SI is in its on position. At the 
end of that 50-second time de- 
lay, RYl de-energizes, its con- 



ii-Liy„jJx 




Q. H^PORCH LIGHT CONTROL AUTOMATICALLY turns on a light for a preset 

mod only when triggered at night 



*+5T0+15V 




>-OUTPUT 



FIG. 12 — ADD-ON PULSE GENERATOR can supplement a stand-alone pulse gener- 
ator. It is triggered by rectangular input signals. Table 1 gives output pulse widths for 
various values of C3. 







CI 
0.01 nF 


iok3 


► 


4 




8 


22K,- 


-4 


t 05 
► 8ZK 

: m 

"lOOK 
4 




8 




rt \i 


2 


IC1 
S5S 


^ l( 


2 


IC2 
555 




INPUT 
P-TO-P 


22K 

R3 : 

10K-« 


6 


O.OOIfiF 


6 

7 


3 




R7 

10K ■ 
(LEVEL)' 

C5 
.OIliF 


Id /^ 


: i 




( 


y 


E01 

1H41 


1 
48 


7 


5 


C2 C3 - 
UmF (SEE 
TfVBLE 2) 


s 


T 


P 


6 
C 


ouTpm" 
o 


mk 




r 



FIG. 13— MODIFIED ADD-ON PULSE GENERATOR can be triggered by any kind of 
Input waveform including sine waves. 



tacts Open, and battery supply 
is disconnected from the 555 
and SI. 

The circuit in Fig, 9 is com- 
patible with modem practice for 
powering the headlights switch 
SI with ignition switch 82 so 
that headlights work only when 
the Ignition switch is on. How- 



ever, the circuit shown in Fig. 10 
is applicable to older vehicles 
whose headlights or spotlight 
are independent of the ignition 
switch. The circuit illustrates a 
manual delayed turn-off light 
control. 

That circuit works If the vehi- 
cle is parked with its lights off. 



They will be turned on for a pre- 
set 50-second period as soon as 
momentary pushbutton start 
switch Si is pressed. When the 
delay period times out, the 
lights will be turned off again 
automatically. 

The Fig. 10 circuit includes 
relay RYl with two sets of nor- 
mally-open contacts. The tim- 
ing sequence is started with the 
momentary closure of pushbut- 
ton switch SI . Normally, both SI 
and the relay contacts are open, 
so the timer circuit is not 
powered and the lights are off. 
Capacitor C3 is discharged un- 
der this condition. 

When SI is momentarily 
closed, RYl's coil is energized. 
That action closes its first set of 
contacts, applying power to the 
car's lights while also closing its 
second set of contacts, applying 
power to the 555. However, 
TRIGGER pin 2 of the IC is briefly 
grounded through C2, so a 
negative trigger pulse is fed to 
it, and a timing cycle is begun. 

Consequently, output pin 3 of 
the 555 switches high when the 
relay contacts close, locking the 
relay into its "on" state (re- 
gardless of the subsequent state 
of SI), keeping the lights on for 
50 seconds. At the end of the 
timing cycle, pin 3 of the IC 
switches to its low state, de-en- 
ergizing RYl. Then both sets of 
relay contacts open, discon- 
necting power from the 555 and 
the lights. 

Automatic porch light 

Figure 1 1 is an automatic con- 
trol circuit for a porch light. It 
will turn a porch light on auto- 
matically for a preset 50-second 
period when its sensor detects 
the presence of a person. How- 
ever, It performs that function 
only at night or under condi- 
tions of reduced visibility such 
as might occur during a storm. 
The circuit is activated with 
switch SI, which can be a 
microswitch triggered by a por- 
ch gate. It might also be a pres- 
sure-switch hidden under a 
porch mat and triggered by a 
person weighing perhaps 50 
pounds or more. 

Circuit operation depends on 
a negative-going pulse that falls 
below the internally controlled 



S" 

I 



so 



a 

3 

a 
en 

2 

c 
3 



I 
I 

.33 

CO 
s* 

o 



us 
68 



+ 5 TO + 15V 




FIG. 14— ADD-ON DELAYED PULSE GENERATOR can be triggered by any input wave- 
form (a). Waveforms at input to IC1 and those at the outputs of iC2 and IC3 based on 
different values of R and C (b|. 



one-third supply voltage being 
fed to TRIGGER pin 2 of the 555. 
If the trigger pulse does not fall 
below that value, the timing cy- 
cles cannot be initiated. 

In Fig. 11, the photocell (re- 
sistor R4 ) and potentiometer R5 
are in series as a light-depen- 
dent voltage divider. One side of 
SI is connected to the Junction 
between R4 and R5, and the 
other side is connected to pin 2 
through a the network of C2 
and R3. In normal dayhght the 
photocell's resistance is low, so a 
high voltage appears at the 
junction of R4 and R5. As a re- 
sult, closing SI sends a voltage 
pulse to pin 2 whose value is too 
low to pull pin 2 below one-third 
of the supply voltage. Thus, the 
timer cannot be triggered with 
SI under those conditions. 

However, the photocell's resis- 
tance value increases at night or 



under reduced visibility, caus- 
ing a low voltage to appear at the 
R4-R5 junction. Under that 
condition, closing SI generates 
a voltage pulse that pulls pin 2 
below the one-third supply volt- 
age value, triggering the timer. 
The cadmium-sulphide (CdS) 
photocell (resistor R4) should 
have a resistance of 1000 to 
47,000 ohms under "dark" 
tum-on conditions. Potentiom- 
eter R5 can be adjusted to preset 
the minimum "dark" level for 
circuit triggering. The trigger 
signal is fed to pin 2 of the 555 
through the C3 and R3, a net- 
work that shapes the trigger 
pulse and effectively isolates the 
DC component of the photocell- 
potentiometer network from 
pin 2. 

Pulse generators 

In all of the circuits presented 



so far, the 555 functions as i 

monostable (one-shot) pulst 
generator. Suitable trigger sig- 
nals are fed to trigger pin 2 anc 
output pulses are taken from 
OUTPUT pin 3. The 555 can gen- 
erate well formed output pulses 
with periods from 5 microse- 
conds to hundreds of seconds. 
The maximum usable pulse re- 
pitition frequency is approxi- 
mately 100 kHz. 

The signal reaching trigger 
pin 2 must be a carefully shaped 
negative-going pulse. Its ampli- 
tude must switch from an "off 
value greater than two-thirds of 
the supply voltage to an "on" val- 
ue less than one-third of the 
supply voltage. (Triggering ac* 
tually occurs as pin 2 drops 
through the one-third supply 
voltage value.) Trigger pulse 
width must be greater than 100 
nanoseconds but less than that 
of the desired output pulse. 
That condition assures trigger 
pulse removal by the time the 
monostable period times out. 

Suitable trigger signals for 
the 555 in the monostable mode 
can be formed by converting the 
input signal to a good square 
wave that switches between the 
full positive supply voltage and 
ground. The square wave is 
then coupled to pin 2 with a re- 
sistor-capacitor differentiating 
network having a short time 
constant. That network con- 



TABLE 2— CAPACITOR VALUES 
FOR PULSE- WIDTHS 

Capacitors C3 Pulse Widtfi Range 
(Microfarads) (Time in Seconds) 


10.0 
1.0 
0.1 
0.01 
0.001 


90 ms 

9 ms 

900 [ls 

90fjLS 
9tJLS 


- 1.2 

- 120 ms 

- 12 ms 
- 1 .2 ms 
-120ji.s 



verts the leading or trailing 
edges of the square wave into 
suitable trigger pulses. 

Figure 12 shows a timing cir- 
cuit that accepts input signals 
already in the form of square 
waves or pulses. TVansistor Ql 
converts a rectangular input 
signal into a form that switches 
between the positive supply and 
ground. The output signal is 




FIG. IS—THREE-STAGE SEQUENTIAL TIMER or pulse generator {a) and waveforms at 
three different output pins (b). 



then fed to trigger pin 2 
through differentiating net- 
work C2-R4. The circuit can be- 
come an add-on pulse generator 
in combination with a separate 
square-wave or pulse generator. 
Variable-amplitude output 
pulses can be obtained from po- 
tentiometer R7. 

The output pulse widths of 
the Fig. 12 circuit can be varied 
over more than a decade range 
with potentiometer R6, and 
they can be switched in overlap- 
ping decade ranges with the val- 
ues of C3 listed in Tkble 2. With 
the component values shown, 
output pulse width is variable 
from 9 microseconds to 1.2 sec- 
onds. Capacitor C4 decouples 
CONTROL VOLTAGE pin 5 to im- 
prove circuit stability. 

Figure 13 shows a modifica- 
tion of the circuit in Fig. 12 that 
can be triggered by any kind of 
input waveform, including sine 



waves. Here the first 555 (ICl) is 
configured as a Schmitt trigger 
to convert all input signals into 
square-wave output signals. 
Those square waves trigger the 
second 555 (1C2) in the mono- 
stable mode in the same way as 
described earlier. The circuit 
can also become an add-on 
pulse generator in combination 
with any kind of stand-alone 
waveform generator that pro- 
duces output signals with peak- 
to-peak amplitudes greater 
than one-half the IC's supply 
voltage. 

Figure 14-a shows how two 
monos table circuits can be con- 
nected in series to make a de- 
layed-pulse generator As in Fig. 
13, the first 555 (ICl) is config- 
ured as a Schmitt trigger. The 
second 555 (IC2) controls time 
delay width, while the third 555 
(IC3) determines the output 
pulse width. 



As shown in Fig. 14-b, the 
output pulse at pin 3 of IC3 ap- 
pears at a time interval after the 
initial application of the trigger 
signal. This time delay width 
Tp, is determined by the prod- 
uct of the value of capacitor C3 
and the sum of the values of re- 
sistor R5 and potentiometer R6. 
in accordance with the time de- 
lay formula given earlier Sim- 
ilarly, output pulse width t^^ *s 
determined with the values of 
C7, and R8 and R9. 

This circuit can become part 
of a stand-alone pulse delay gen- 
erator by building it into a 
square-wave generator case. 
The square -wave generator will 
provide the initial trigger sig- 
nals needed. 

A number of monostable 
pulse generators can be placed 
in series to operate in sequen- 
tial form. Figure 15-a, for exam- 
ple, shows a three-stage se- 
quential generator circuit. It 
can control lamps or relays in a 
pre-programmed time sequence 
after pushbutton switch 81 is 
pressed to give the start 
command. Note that the reset 
pins (pin 4) of all three 555's are 
shorted together and positively 
biased by R6. Those pins can be 
shorted to ground with set 
switch S2, When power is ap- 
plied, SI should be closed, en- 
suring that none of the 555's in 
the circuit are falsely triggered. 

Figure 14-b shows the wave- 
forms from the output pins of 
all three 555s (ICl to IC3). The 
time delay tpj is determined by 
the values of 01 and R2, t^g is 
determined by the value of C4 
and R4 and t[33 is determined by 
the values of C7 and R7 when 
inserted in the time delay for- 
mula given earlier. 

Finally, three or more mono- 
stable circuits can be connected 
with capacitor C9 (shown in a 
dashed connection line) be- 
tween SI and pin 3 of the third 
555 (IC3}. This loop feeds a sig- 
nal back from the output pin of 
1C3 to the input trigger pin of 
ICl, permitting infinite repeti- 
tion of pulse sequence. The cir- 
cuit can drive LED's and digital 
logic. The circuit also has the 
reset capability provided by S2 
that clears the circuit when 
power is first applied. R-E 



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let up a versatile sloping-vee antenna for 
'our shortwave receiver ofiiam rig 
o improve your transmission 
md reception at low 




THE SLOPING-VEE ANTENNA IS ONE 

of the most versatile broadband 
antenna designs available to 
amateur radio enthusiasts and 
shortwave listeners. It is struc- 
turally simple, inexpensive, 
easy-to-build, and easy to set up 
In the field if you want to take 
your rig with you on vacation. 
The sloping vee can achieve 
moderate and occasionally even 
, h Igh gain over a frequency span 
I of 5 to 1. 10 to 1, or more. The 
' antenna is functional over the 
high-frequency (HF) into ultra- 
high- frequency (UHF)-range 
from about 3 MHz to about 800 
MHz. 

The most common configura- 
tion for the sloping-vee antenna 
is shown in Fig. 1 . It consists of 
two sloping, radiating elements 
(wires) fed by a radio-frequency 
source at their vertex. The 
source is located at a height H 
above the ground, and the ele- 
ments are terminated by two 
equal resistors, R. located at or 



near the Earth's surface. Tech- 
nically it is an inverted-vee slop- 
ing antenna. 

The true sloping-vee antenna 
has a vertex height, H, that is 
actually less than the height of 
its terminations. The radiating 
elements slope up from the 
ground, not down as shown in 
Fig. 1, making this configura- 
tion more difficult and expen- 
sive to build because two masts 
are required. However, both 
forms are called sloping vee's be- 
cause they resemble a tilted let- 
ter "V." 

This article presents a sys- 
tematic design procedure that 
takes into account the unique 
characteristics of this antenna. 
A typical design for an HF/VHF 
10- to 60-MHz sloping-vee an- 
tenna is discussed in detail, and 
measured performance data for 
the actual antenna is given. A 
frequently overlooked feature of 
the sloping-vee antenna at HF 
and a major advantage is that it 
combines the features of hori- 
zontal and vertical antennas, 
which results in virtual polar- 
ization diversity. 

In a careful design, the 
characteristics of the communi- 



RICHARD A. FORMATO 



cation links to be supported by 
the antenna must be consid- 
ered. For example, the take-off 
angles at which the antenna 
must have adequate gain are de- 
termined by the transmitter-to- 
receiver distance and by the vir- 
tual ionospheric reflection 
height. 

Another design constraint is 
the antenna's required band- 
width which is determined by 
the operating frequencies. For 
some amateur radio operators, 
only the HF band (3 to 30 MHz) 
is of concern; others want to 
cover the upper HF range and 
the 6-meter (50 kHz) band as 
well. High -gain antennas such 
as Yagis exhibit a bandwidth of 
a few percent of the center fre- 
quency. A well designed sloping 
vee, by contrast, wiU cover the 
entire HF spectrum and even ex- 
ceed it. 

Antenna siting is another im- 
portant consideration in the de- 
sign of a sloping vee. From HF 
well into the VHF range, the 
Earth's electrical charac- 
teristics (ground conductivity 
and dielectric constant) have a 
dramatic effect on antenna per- 
formance. Ground effects are 
especially Important at low 
take-off angles (close to the 
horizon). 

Shallow take-off angles are 
necessary for long-range trans- 
mission. For very long dis- 
tances, the take-off angle could 



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FIG. 1— A SLOPING-VEE ANTENNA is simple, inexpensive to build and erect, and 
provides excellent broadband performance from HF well irito VHF. 



be so low that mountains or 
other terrain features block sig- 
nal transmission. Those 
obstructions limit the mini- 
mum take-off angle which, in 
turn, limits the range. 

Sloping-vee operation 

As shown in Fig. 1, the RF 
source excites current waves on 
the vee's radiating elements. 
The total current consists of 
two components: an incident 
wave propagating from the 
source toward the end of the ele- 
ment, and a reflected wave prop- 
agating from the terminating 
resistor back toward the source. 
In an ideal vee, the reflected 
component is zero because the 
terminating resistor absorbs 
any incident energy that would 
otherwise be reflected. In prac- 
tice, there is a only a slight re- 
flected component. The inci- 
dent and reflected waves com- 
bine point-by-point along the 
element length to form a weak 
standing- wave pattern. An un- 
terminated antenna, such as a 
center- fed, half-wave dipole, 
propagates a reflected wave with 
a large amplitude that creates a 
strong standing-wave pattern. 

The half-wave dipole is a reso- 
nant, narrow band, standing- 
wave antenna. By contrast, a 



properly designed vee is a non- 
resonant, broadband, travel- 
ing-wave antenna. Broadband 
operation is obtained from the 
vee antenna by eliminating as 
much of the reflected current 
wave as possible. The terminat- 
ing resistors are capable of ab- 
sorbing most of the incident 
energy that is not radiated from 
the elements. If the terminating 
resistor is conjugate-matched 
to the characteristic impedance 
of the radiating element, there 
is no reflected signal because all 
of the power is absorbed. 

This situation is the same as 
the maximum power transfer 
condition for a transmission 
line feeding a load. The load ab- 
sorbs maximum power when its 
internal impedance is equal to 
the complex conjugate of the 
transmission line's charac- 
teristic impedance Z^. Because 
Zq for well-designed transmis- 
sion lines is nearly a pure resis- 
tance, the matched load is a 
resistance of equal value. The 
most common coaxial cable im- 
pedance is 50 ohms, and the 
corresponding matched load is 
a resistive 50 ohms. The load 
could be a 50-ohm dummy (es- 
sentially a resistor), or it could 
be an antenna with an input Im- 
pedance of 50 -l-jO ohms. 



The frequencies at which the 
vee exhibits near traveling- wave 
behavior determine its useful 
bandwidth. The precise defini- 
tion of impedance bandwidth is 
the range of frequencies at 
which antenna input voltage 
standing-wave ratio (VSWR) is 
less than or equal to some 
threshold value, typically 2 to 
2.5:1 for transmitters and up to 
5:1 for receivers. There are dif- 
ferent thresholds because 
transmitter circuits cannot tol- 
erate high VSWR without re- 
ducing output power or shut- 
ting down: by contrast, a 
receiver is not limited by VSWR. 

For receive-only operation, in- 
creased antenna VSWR causes 
higher mismatch loss into the 
receiver front-end, which re- 
duces the available signal level. 
There is a point at which the 
mismatch loss is so high that 
receiver sensitivity (minimum 
detectable signal) becomes un- 
acceptable low. Figure 2 is a plot 
of mismatch loss as a function 
of VSWR with one end of the 
transmission line matched . At 
a VSWR of 5:1, receiver sen- 
sitivity is reduced by only 2.5 
dB; but at 21:1, the reduction 
approaches 8 dB. 

An objective for the design of 
a vee antenna is to maximize 
the range of frequencies in 
which VSWR is less than 2.5:1 
for transmission and less than 
5:1 for reception. An antenna 
meeting the transmission crite- 
rion between 3.5 and 30 MHz, 
for example, could be loaded di- 
recUy on all bands from 80 to 10 
meters without a tuner or 
matching network! The same 
antenna could receive over an 
even wider bandwidth. 

Design procedure 

The design of a good vee in- 
volves three steps. The first is to 
evaluate the kinds of communi- 
cation links for which the an- 
tenna is intended. The designer 
must answer the following 
questions: What are the dis- 
tances and operating frequen- 
cies involved, and what is the 
propagation mode? The second 
step calls for the selection of the 
vee's apex angle based upon the 
intended operating frequency 
and antenna size. The third 



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FIG. 2— PLOT OF MISMATCH LOSS in decibels vs. VSWR with one end of the transmis- 
sion-line matched. 



step is the computation of the 
antenna radiation patterns for 
the desired distances. 

The assumed specifications 
for the design of a vee antenna 
are: 

• Frequency range — 15 to 50 
MHz (continuous) 

• Propagation mode — meteor 
trails at 100 kilometers 

• Link distances-^00 to 1200 
kilometers (250 to 750 miles 

• Antenna siting — limited to an 
area 100 x 100 feet and a height 
25 feet 

• Main lobe gain — dBi, mrni- 
mum value 

Step 1 — Link evaluation 

Three transmission-path fac- 
tors influence vee design: dis- 
tance between transmitter and 
receiver (determines antenna 
take-off angles); operating fre- 
quencies (determines required 
bandwidth); and propagation 
mode (determines take-off an- 
gles). Each of those factors must 
be known or estimated to de- 
sign an antenna matched to the 
path. 

Signals propagating between 
points on the Earth's surface 
are bent by the ionosphere or 
other scattering mechanism 
such as a meteor reflection. The 
miost common (but not the only) 
propagation mode at HF is the 
skywave. The transmitted sig- 
nal is bent back toward the Ear- 
th's surface by the ionosphere's 



changing refractive index. This 
process is equivalent to a spec- 
ular reflection from a virtual re- 
flection point. The simplest 



model of HF skywave propaga- 
tion is a straight-line signal ray 
from the transmitter to a loca- 
tion near the reflection point 
where it is bent back as another 
straight line ray from the reflec- 
tion point to the receiver as 
shown in Fig. 3. 

The attainable distance in a 
communication path depends, 
in part, on the reflection height, 
with higher reflections provid- 
ing greater distances. HF sky- 
wave propagation is caused by 
reflections from the iono- 
sphere's layers: D layer (about 
50 kilometers high), E layer 
(about 120 kilometer high) and 
F layer (200 to 500 kilometers 
high). Meteor-trail reflections 
are of growing interest because 
of the increased availability of 
high-speed packet data equip- 
ment. Those reflections occur at 
altitudes of about 100 kilo- 
meters. 

The path geometry (reflection 
height and transmitter-to-re- 



VIRTUAL REFLECTION 
POINT 



METEOR REFLECTION 



IONOSPHERE 

F-LAYER100TD260MI 

E-LAYER60TO70MI 

D-LAYER35TO60MI 




FIG. 3— OIAGRAM SHOWING RELATIONS between take-oft angle, virtual reflection 
point, and signal range. 






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velver distance) determines the 
range of required take-off an- 
gles for the antenna. Signal rays 
transmitted at too high an angle 
fall short of the receiver, while 
those transmitted at too shal- 
low an angle can overshoot the 
receiver 

Figure 3 shows two important 
angles in vee design. The take- 
off (or elevation) angle is mea- 
sured upward from the earth's 
surface to the ray direction. The 
polar {or zenith) angle is mea- 
sured down from the vertical to 
the ray direction. Both angles 
are important because path re- 
quirements are usually de- 
scribed in terms of the take-off 
angle, but antenna perfor- 
mance is usually referred to a 
coordinate system bas^d on the 
polar angle. The sum of the pol- 
ar angle and the take-off angle is 
90°, so the polar angle can al- 
ways be determined by sub- 
tracting the take-off angle from 
90° and the take off-angle can be 
found by subtracting the polar 
angle from 90°. 

Figure 4 is a communication- 
range plot. The left vertical axis 
is the maximum range in kilo- 
meters for a specific take-off an- 
gle in degrees, while the right 
vertical axis is the maximum 
obstruction height in feet vs. 
take-off angle. Three range vs. 
take-off angle curves are plotted 
for different reflection heights, 
and each curve is labeled with 
the height (100, 300, and 500 
kilometers). These curves were 
computed for an Earth spher- 
ical radius of 6371 kilometers. A 
"Vs-Earth" correction factor 
(Earth radius increased by Vs] is 
sometimes used at HF. Applying 
that correction would modify 
the curves shown somewhat. 

Either the maximum path 
distance for a given take-off an- 
gle or the appropriate take-off 
angle for a specified distance 
can be determined from Fig. 5. 
At a take-off angle of 20°, for ex- 
ample, the maximum range is 
about 2100 kilometers (1300 
miles) for 500-kilometer reflec- 
tions in the F2 region. The 
range Increases to 4000 kilo- 
meters (2500 miles) at about a 
5° take-off angle. 

If the path length were 3200 
kilometers, the appropriate 



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30 40 50 60 

TAKE-OFF ANGLE (DEGREES) 

FIG. il — COMMUNICATION RANGE PLOT: maximum range and maximum obstruction 
height vs. take-off angle 



take-off angle for 500-kilometer 
reflections is about 10°, and it's 
about 3° for 300-kilometer re- 
flections. Also plotted in Fig. 5 is 
a family of five obstruction 
height curves. They are impor- 
tant in antenna siting, es- 
pecially for very shallow take-off 
angles (long paths). 

Figure 5 shows the transmit- 
ted-ray geometry for a signal 
obscured by a hill or mountain. 
The obstruction with height H 
is located at a distance R from 
the antenna. The minimum 
take-off angle corresponds to 
the ray that just grazes the 
obstruction as shown. TVans- 
mltted or received signals at 
smaller take-off angles are 
blocked by the obstruction. 

The curves related to the right 
vertical axis in Fig. 4 show the 
maximum allowable obstruc- 
tion height in feet vs. the take- 
off angle. For example, if the 
path requires a take-off angle of 



20°, a land-mass or structural 

obstruction V^ mile away must 
be less than 500 feet high if the 
ray is to pass without being 
blocked. A 500-foot hill '/t mile 
away would obscure all signals 
with take-off angles below 20°. 
Higher obstructions can be tol- 
erated if they are further away. 
At a distance of 'A mile, for ex- 
ample, the obstruction could be 
as high as 1000 feet before 
obscuring a ray with a 20° take- 
off angle. 

The curves in Fig. 4 also show 
maximum range in kilometers 
vs. take-off angles in degrees for 
the vee. For 100-kilometer re- 
flections, the most effective an- 
gles are between about 8° and 
25°. The objective in designing 
a vee antenna is the placement 
of this lobe in this angular 
range. The the 8° minimum 
take-off angle requires that the 
antenna b^ carefully sited to 
avoid lobe blockage by a nearby 



a-,^ OBSTRUCTION 

t--^..1^ HEIGHT H 




FIG. 5— DIAGRAM SHOWING MINIMUM TAKE-OFF angle to avoid a nearby signal- 
blocking obstruction. 



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ill or structure. The maximum 
.eight of that obstruction can 
e only about 200 feet if the an- 
;nna is to be located Vi mile 
way. This requirement might 
asily be exceeded in hilly ter- 
ain or near tall buildings. 

Step 2 — ^The apex angle 

Figures 6 and 7 plot the op- 
imum vee apex angle in degrees 
is it changes with frequency 
md antenna element (radiator) 
ength. The apex angle is inver- 
sely related to both frequency 
ind element length. Thus, 
ihort elements at low frequen- 
;ies must have wide apex angles 
vhile long elements at high fre- 
^uencis can have small angles. 
The curves in Fig. 6 are for fre- 
rjuencies of 10, 30, and 50 MHz 
ivith respect to element lengths 
in meters, while those in Fig. 7 
are for element lengths of 20, 40 
and 60 meters with respect to 
frequency. Our example vee 
must operate over a wide fre- 
quency range (15 to 50 MHz). 

It turns out that a given apex 
angle is optimum at only one 
frequency not over a range of 
frequencies. Therefore, the se- 
lection of an optimum apex an- 
gle calls for both judgment and 
compromise. The objective is to 
select an angle that provides 
good performance at all fre- 
quencies over the stated range. 

The design example calls for a 
vee antenna that will fit in a 100 
X 100 foot square plot. There- 
fore, 40- or 60-meter elements 
are too long; only the 20-meter 
length will fit. By referring to 
both Figs. 6 and 7, it can be 
seen that for a 20-meter element 
the optimum apex angle at 10 
MHz is 116°, but at 50 MHz it is 
54°. it can also be seen that a 
good compromise for apex angle 
with a 20-meter element over 
the 15- to 5O-MH2 band can be 
reached by finding the apex an- 
gle for 30 MHz —69°. That angle 
will now become the trial value, 
and it will be retained unless the 
gain or pattern fails to meet the 
design objectives. In that case, 
the selection process must be 
repeated with another choice 
for the apex angle. 

Now look at the vee input re- 
sistance at the design apex an- 
gle. Figure 8 is a plot of input 



resistance in ohms (R („) vs. fre- 
quency for apex angles of 40°, 
70°, and 100°. The input resis- 
tance value for a 70" apex angle 
at 30 MHz is about 690 ohms. 
(The vee is generally considered 
to be a 600-ohm antenna, so 
this is close to a match). The 
value of input resistance in- 
creases to 780 ohms at 15 MHz 
but drops to 630 ohms at 50 
MHz. For design purposes, 690 
ohms can be selected as a repre- 
sentative average value of R^ 
over the 15- to 50-MHz band. 

The value of R,n is needed to 
specify the vee input balun. Be- 
cause the vee is a balanced radi- 
ating system, feeding it with an 



unbalanced coaxial cable re- 
quires a balun (a balanced to 
unbalanced transformer). 
Matching a 50-ohm transmitter 
to 690 ohms requires a 14:1 bal- 
un, which can be made by wind- 
ing magnet wire on a ferrite core 
or purchasing the component 
complete. 

A value for R^^ is also needed 
In the specification of each ter- 
minating resistor. Those values 
are R,n/2 (345 ohms for the de- 
sign example). Select the stan- 
dard value closest to 345 ohms. 
That value is not critical be- 
cause Rin changes with fre- 
quency. 

The tentative geometry for the 




30 40 50 60 

ELEMEHT LENGTH (METERS) 
FIG. 6 — OPTIMUM APEX ANGLE for sfoping-vee antenna: plot of optimuin angle vs. 
element length at three different frequencies. 



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110 
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FREQUENCY (MHi) 

FIG, 7— OPTIMUM APEX ANGLE for sloping-vee antenna: plot of optimum angle vs. 
frequency for three different element lengths. 



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75 




25 30 35 40 45 
FREQUENCY (MHz) 
FIG. 8— PLOT OF INPUT RESISTANCE vs. frequency for a sloping-vee antenna 



60 66 



15- to 50-MHz vee is shown in 
Fig. 9. Each radiating element 
is 62 feet (20 meters) long, and 
the apex angle is 69°. The re- 
quired separation at the ends of 
tiie elements can be calculated 
with trigomometry or plotted to 
scale on paper with a" protractor. 
For the 69°-apex angle, the ends 
of the elements must be 72.5 
feet apart. 

Step 3 — Radiation Patterns 

An antenna is efficient only if 
it radiates signals with ade- 
quate gain in the desired direc- 
tion. The final step in the design 
of the vee is to compute its radi- 
ation patterns to verify that they 
meet the gain requirements. 
Software compatible with per- 
sonal computers is available for 
this purpose from the source 
listed in Sources of Materials, 

Certain parameters such as 
feed-point height, termination 
height, and element length 
should be varied before writing 
a final antenna specification. 
& Changing any of those param- 
2 eters will modify the radiation 
fe patterns. The design process is 
"S complete when the antenna ra- 
^ diates acceptable patterns. If a 
^ specific design doesn't meet re- 
s' quirements, the process should 
z be repeated with new design val- 
S ues until they are met. A re- 
g petitive approach ensures a 
f good design, and also gives the 
Qj designer insight into how an 
antenna's performance changes 
76 with parameter differences. 



For the design example, an el- 
ement length of 20 meters was 
determined from the siting cri- 
terion. iWissing are the design 
heights for the feed point and 
terminating resistors. Because 
the maximum height cannot ex- 
ceed 25 feet, it is convenient to 
start by assuming a feed-point 
height of 6 meters (19.5 feet) 
and a termination height at 
ground level. The effectiveness 
of those choices will become 
clear as the radiation patterns 
are studied. 

Radiation patterns were cal- 
culated every 5 MHz from 15 to 
50 MHz, the intended operating 
range, with the tentative design 



values and element lengths of 
20, 40 and 60 meters. Although 
only the 20-meter element 
meets the 100 x 100 foot site 
limit, it's instructive to see how 
the pattern changes with longer 
elements. Figures 11, 12, and 13 
show the patterns at 15, 30, and 
50 MHz. Those frequencies 
mark the endpoints and mid 
portion of the desired band. In 
ail three figures the mast height 
is 6 meters, the apex angle is 
69". the diameter of the element 
is Va inch and the termination is 
689 ohms. 

Results at intermediate fre- 
quencies are not included here. 
The patterns were computed 
with the sloping-vee antenna lo- 
cated on rocky ground with a 
conductivity of 0.001 Siemens/ 
meter and a dielectric constant 
of 4. The patterns change if dif- 
ferent ground constants are as- 
sumed, so sensitivity to ground 
constants was also examined, 
although those results are not 
included here. 

Figure 10 shows the pattern 
at 15 MHz. The left vertical axis 
is the antenna power gain in 
dBi (decibels relative to an iso- 
tropic radiator, an antenna that 
radiates in all directions). The 
horizontal axis is the polar an- 
gle in degrees. Note that the pol- 
ar angle, not the take-off angle, 
is used on the horizontal scale. 
A polar angle of zero is a vertical 
with respect to the Earth 




FIG. 9~>FtNAL DIMENSIONED DESIGN for a sloping-vee antenna that can be set up oil 
a 100 X 100 foot plot. 



b 














L=40 METERS 





-S 
-10 
-15 








1 -An MfTFRK 


^ 


*•"" ' 


N 








J—* 


Ji 


^ 


^ 


L=20 MFTERS\ 


K 




/A 


X 


f 








\ 


A 


M 


'r 














\ 



10 20 30 40 50 60 70 80 90 

G. 10 — GAIN VS. POLAR ANGLE for a sloping-vee antenna above rocky ground at a 
»)uency of 15 MHz for various element lengths. 



;> 














L=20 


;flETERS/ 


^ 


METERSV 


\ 





















// 


r 




\\ 
















I 


JLt 


(0 METER! 




^ 


\ 


-5 
-10 
-15 














/ 


1 










A. 


A/ 


>A 


A 


// 








\ 


\ 


% 


ft 


/^ 


1 








' 


( 


) 


2 





3 


4 





c 


fl e 


7 


8 





90 



FIG. 11— GAIN VS. POLAR ANGLE for sloplng-vee antenna above rocky ground at a 
frequency of 30 MHz for various element lengths. 



;: ~5 








20 



30 40 50 60 

POUR ANGLE, THETA (DEGREES) 
FIG. 12— GAIN VS. POLAR ANGLE for sloping-vee antenna above rocky ground at a 
frequency of 50 MHz for various element lengths. 



(zenith), while 90° is parallel to 
the Earth's surface (horizon). 
Tkke-off angles of interest, 8° to 
25°, correspond to polar angles 
of 82° to 65° in the figure. The 
design objective is to obtain at 
least dBi gain in a main lobe 
propagating generally between 
polar angles of 65° to 82°. 

The main lobe maximum gain 
at 15 MHz is -1.5 dBi at 57° for 
the 20-meter element. The lobe 
is broad, and the gain rolls off 
slowly on either side of the max- 
imum. The -3 dB points are at 
about 32° and 74°. The highest 
gain, 1.5 dBi. is obtained with 
the 40-meter element in a broad 
main lobe that shows minor 
scalloping (sidelobing) near 
40°. The pattern for the 60- 
meter element shows signs of 
breaking up — a significaxit sec- 
ondary lobe is forming near 18°, 

The 30-MHz pattern (Fig. 11) 
is interesting because all three 
elements produce a maximum 
gain of about 4 dBi, and their 
main lobe structures are very 
similar. The lobes are broad and 
smooth between 40° and 88° 
and the -3 dB points are near 
55° and 82°. The 40- and 60- 
meter elements show consid- 
erable pattern scalloping be- 
tween 0° and 40°, but the 20- 
meter element is electrically too 
short to develop a highly struc- 
tured pattern. 

Scalloping is due to con- 
structive and destructive inter- 
ference between direct rays 
from the antenna and rays re- 
flected from the Earth's surface. 
Electrically long antennas (mea- 
sured in wavelengths) are more 
susceptible to scalloping than 
shorter ones. Sidelobes waste 
energy by radiating it in un- 
desired directions. Good anten- 
na designs, therefore, minimize 
sidelobes as much as possible. 

The 50-MHz vee pattern is 
shown in Fig. 12. The main lobe 
is again similar for the three ele- 
ment lengths. Maximum gain is 
about 6. 5 dBi near 77° ( 13° take- 
off), and the -3 dB points are at 
approximately 70° and 83°. The 
main lobes are smooth and nar- 
rower than they are at the lower 
frequencies. The 20-meter ele- 
ment is beginning to show 
some scalloping. It has a peak 
sidelobe gain of -2 dBi at 50°). 






ha 



3 



i 



77 



Si 

I 

s 

Cr> 

S' 

o 
Z 



s 



78 



However, the 40- and 60- meter 
antenna elements show more 
scalloping and even higher side- 
lobe gains. 

An assessment of the pat- 
terns supports the conclusion 
that a vee antenna with 20- 
meter elements fed at a 6-meter 
height with a 69° apex and 
ground-level terminating re- 
sistors meets the objectives. 
Gain could be improved at the 
low end of the band with a lon- 
ger radiating element, but that 
could violate the site limit. 

The actual dimensions se- 
lected for the vee antenna are 
those of Fig, 9. A shorting wire 
connects the terminating re- 
sistors (which might or might 
not be connected to actual 
Earth ground). That wire, a cur- 
rent path between the resistors, 
is very important. In an ideal 
vee, the resistors are connected 
to a perfect ground plane that 
provides the current path. 
Omitting the shorting wire in a 
vee mounted on poorly con- 
ducting ground degrades per- 
formance significantly. 

Antenna Construction and 
Measured VSWR 

The antenna shown in Fig. 9 
was built and tested on rocky 
ground in New England. It was 
fed through a 14: 1 balun wound 
with 18 AWG magnet wire on a 
2-inch outside diameter toroi- 
dal ferrite core. The turns ratio 
is the square root of the imped- 
ance ratio (in this case 3.75:1). 
The balun was wound with 2 
turns in its primary and 7.5 
turns in its secondary. If the 
sloping-vee is to transmit, the 
balun should be tested for 
power handling by operating at 
full power for several hours. Any 
problems that might develop 



SECONDARY 
PRIMARY 



TO 
TRAHSMITTEn ' 



2 TURNS 




SECONDARY 

PRIhWRY 



TO 50-OHM 
■ DUMMY LOAD 



2 TURNS 



7.5 TURNS 7.5 TURNS 
BALUN 1 BALUN 2 

FIG. 13— BACK-TO-BACK INSERTION 
LOSS TEST of baluns for sloping-vee an- 
tenna. 



11:1 

10:1 

ai 

8:1 

I 7:1 



M- » J '.J. 1, 



3 6:1 



5:1 
4:1 
3:1 



! I I r 



^ 



BALUN 



RADIATING ELEMENT 



OHMS 




-1 TYPE'N 
BARREL 



75 FT 

■ii CID VSWR i 

CALIBRATION " 
POINT 



COAXIAL FEED 
CABLE RG-213/U 




30 35 40 

FREQUENCY {MHz] 

FIG. 14— PLOT OF VSWR VS. FREQUENCY for sloping-vee antenna witfi charac- 
teristics stiown. 



SOURCES OF MATERIALS 
The following companies are 
sources for materials and com- 
puter software for this project: 

• Toroidal ferrite cores (Part No. 
FT240-43)— Radio Kit, Inc., P,0, 
Box 973, Pelham, NH 03076, (603) 
635-2235 

• Film power resistors — Power 
Film Systems, Inc., Yellville, AR 
72687. (501) 449-4091 

• Antenna design software — 
Phadean Engineering Co., Inc., 
P.O. Box 611. Shrewsbury, MA 
01545, (508) 869-6077 

• Phosphor-bronze wire — Astro 
Industries, Inc., Dayton, OH 
43432, (800) 543-5810 

• Fiberglass tubing— J, T, Ryer- 
son Co., P. O. Box 1111, Boston, 
MA 02103, (617) 782-6900 



such as transmitter overheat- 
ing and arcing will show up. 

The simplest way to test a bal- 
un is to build two and connect 
them back-to-back as in Fig. 13. 
One balun is connected to the 
transmitter and the other is 
connected to a 50-ohm dummy 
load. This setup can also test for 
insertion loss by measuring the 
input and output power. The in- 
sertion loss in decibels for one 
balun is 5 log^j, (output power/ 
input power). The measured in- 
sertion loss of the balun in this 
this vee was a low 1.5 dB. 



The 6-meter antenna mast 
was a single 20-foot section of 
round 2-inch diameter Extren 
500 fiberglass tubing with V*- 
inch wall thickness. This mate- 
rial is strong, durable, and easy 
to machine. Extren 500 is avail- 
able as round and square tub- 
ing, right-angle stock, flat 
stock, and I-beams in various 
sizes. A suitable base for a self- 
supporting mast can be made 
from those materials. 

Alternatively, the fiberglass 
mast can be guyed at several 
points. The balun, eye-hook 
strain reliefs for the vee radiat- 
ing elements, and the input 
coaxial connector were 
mounted as shown in Fig. 9. If 
fiberglass tubing for the mast is 
not readily available or it costs 
more than you want to spend 
(about $4 per foot), other suit- 
able insulating materials such 
as thick-wall polyvinyl chloride 
(PVC) tubing is a good sub- 
stitute. 

Other less expensive mast al- 
ternatives include wood beams 
or even living trees. 

The antenna radiating ele- 
ments were 62-foot lengths of 
uninsulated 7 x 19 stranded 
phosphor-bronze wire with a di- 
ameter of '/a-inch. Stranded 
continued on page 100 



Receive amateur TV signals on a standard TV 
witii our low-noise downconverter. 




Douinconverter 



WILLIAM SHEETS and RUDOLF F. GRAF 



YOU CAN RECEIVE AMATEUR TV SEC- 

nals on a standard TV receiver 
with our inexpensive ATV 
downconverter. The downcon- 
verter converts the 420-450 
MHz ATV band, which is several 
channels below the lower limit 
of the UHFband. to channel 3 or 
4 for viewing on virtually any 
TV. The downconverter has a 
low-noise preamplifier stage 



IIIU Cl UULl"J"L-UCltCAJi^^« t"^^ — 

mixer for good performance and 
a wide dynamic range. That is 
necessary with todays crowded 
UHF bands. The converter 
draws about 27 milliamperes 
"-nm a 13.2-voU DC source, so it 
n be used in portable and 
obile applications. An extra IF 
stage gives an overall gain of 
about 25 dB. 

Circuitry 

Figure 1 is a block diagram oi 
the downconverter. It consists 



of three active stages and a pas- nominally 60-70 MHz lower 

s ve mode double-lalanced mix- than the received frequency.^ A 

er. The input signal is first fil- 2-dB pad is u 

tered so that only signals oscillator and 

centered around 430 MHz are mteraction Th 

fed to 91 . an RF amplifier with a the m'^er is 

20-dB gain and a noise figure of lUer that cut 

L5 dB. Ql is an NEC 25137 gal- MHz, That 

llum-arsenide field-effect tran- [^edthroui 

sistor. or GaAsFET The ampli- boosts the 11 

fied signal in the 420^50 MHz MHz (c^hann 



bandpass filter. The overall 
bandwidth of the RF stage is 
about 12 MHz. which is suffi- 
cient to cover the most fre- 
quently used part of the ATV 
band (426^39 MHz) without 
retuning. For operation over the 
entire 420-450 MHz band, you 
may have to repeak the filters to 
tune in weak signals. 

The amplified signals are 
mixed by a diode double-bal- 
anced mixer with an oscillator 
signal (generated by Q2) that is 



an IF amplifier. 

Figure 2 shows the schematic 
of the downconverter. The input 
signal from J 1 is applied to a tap 
on LI. the input (antenna) coil. 
LI is nominally a 3-turn coil and 
the tap is at % turn so that the 
voltage applied from Jl is 
stepped up four times. Capaci- 
tor Cl tunes LI to resonance, 
and is also connected to gate 1 ot 

Capacitors C3 and C4 provide 




FIG. 1— DOWNCONVEBTER BLOCK DIAGRAM. It consists of three active stages and a 
passive diode doul^le-balanced mixer. 






i 

CO 

I" 



c 
2 

in 



eo 




FIG. 2— DOWNCONVERTER SCHEMATIC. Tiie input signal from J1 is applied to a tap 
on L1. Capacitor CI tunes LI to resonance and passes the signal to Q1, an NEC 25137 
GaAsFET. 



RF bypassing for the source of 
Ql, and Rl provides self-bias for 
Ql. Gate 2 of Ql is biased by 
network R2, R3 and R4. An ex- 
ternal gain-control signal 



(which is usually not required) 
can be applied to the junction of 
R3 and R4 if it becomes neces- 
sary to reduce the gain of the 
converter on very strong sig- 



nals. A DC voltage of +6 volts 
will cause full gain, and -6 
volts will cause nearly a - 40-dB 
reduction in gain. The voltage 
can be derived from an AGC cir- 
cuit, if necessary, but a potenti- 
ometer can also be used. 
Capacitor 02 provides RF 



J1 

AMTENHA 
INPUT 



f 



DOWN 
CONVERTER 



TO RIO 
j (REMOVE R1 4) 
SEE FIG.2 
REMOTE 
TUNING 
VOlTftGE 
2-12V 



IT 



J2 



14-21VDC 



LENGTH 
UP TO 300' 



IF OUT 

+ 12V 

IMAIN CONVERTED 

SUPPLY 
Igy REGULATOR 




-^^^hOZ^UJ 



>J3 



IC1 
LM781Z 



C32*T^ 
.OImfL 



R20 

IK 



06 
111759 

12VZENER DIODE L-vw 
R21-': 
1K -• 



I WEATHER PROOF 
ANTENNA BOX 



C34 4- 



C30: 

10mF 



C31 
.OIpF 



^fJ 



C33 



TRANSMISSION 
LINE 
(R65B A/U) 
(R659 A/U) 
CONNECTOR 
IBNCORF) 




R22 
12K 



L11 . 
16^lH ; 
CHOKE 



C3S 
.OOljiF 



■4 



J4' 

TO TV RECEIVER 

CH3 OR CH4 t 



R23 
10K 
CONVERTER 
TUNING 



t 



C3€ -^^ 
IOOmF 



Q7 
2N2Z22 



TUNING 
BOX 



CONVEHTERI 

POWER SUPPLY 

26V 




^G. 3— THE DOWNCONVERTER can be supplied with an external DC voltage for 
emote-control tuning. 



'^ciiKy//^/W///y//^///yjWA//////^^^^ 




-nil — 



R12 

I 



J2 
1 OUTPUT 



w^w////mw/y/yy///y//////////^////^^^^ 







03 



\V2 




m 



mm 



use EITHER , 

R14 - 1 — Ij 
POSITION I 



R14 
{ALTFRNATFi 



FIG. 4— PARTS-PLACEIMENT DIAGRAM. This layout must be followed exactly to dupli- 
cate the performance of the downconverter. Some components mount on ttie solder 
side of the board as shown In Fig. 6. 



grounding for gate 2 of Ql, and 
R5 reduces any UHF parasitic 
oscillations. The drain of Ql is 
connected to a tap on L2, which 
is part of the bandpass filter net- 
work. Capacitors C7 and C8 
provide RF grounding for the 
cold end of L2. DC bias is fed 
through R6. Under normal con- 
ditions, the drain pin of Ql will 
be at + 10 to + 11 volts DC. 



Capacitor CIO couples the 
signal from the first tuned cir- 
cuit (C5-L2) to the second tuned 
circuit (C6-L3). The value of CIO 
is very small (0.6 pF); it deter- 
mines the degree of coupling be- 
tween L2 and L3. It is made 
from a small piece of PC board 
material and is mounted on the 
bottom of the main board. A sig- 
nal from a tap on L3 is fed via 



+ 12V 

test jumper JUl to mixer Ml. 
The local oscillator (L.O.) signal 
from Q2 is also fed to the mixer. 
Tiransistor Q2 is the local os- 
cillator, for which R13, Dl, C14. 
and C16 provide a stabilized 9 
volts DC. Because Q2 is a PNP 
transistor, it allows the collector 
to be DC grounded, which is an 
advantage in this type of os- 
cillator circuit. Resistors R7 
and R8 provide base bias for Q2, 
Cll provides a solid RF ground 



I 
m 

a 

3 

s' 

z 
i 



81 



PARTS LIST 



ffl 



I 



All resistors are V^-watt, 5%, un- 
less otherwise noted. 

R1— 180 ohms 

R2--1 00,000 ohms 

R3,B4— 220,000 Ohms 

R5— 10 ohms 

R6— 220 ohms 

R7— 6600 ohms 

R8— 2200 ohms 

R9— 330 ohms 

RIO— 10,000 ohms 

R11— 15 ohms 

R12— 390 ohms 

R13, R15— 470 Ohms, 'A-watt 

R1 '1—10,000 ohms, potentiometer 

with shaft 
R16— 1000 Ohms 
R17— 4700 ohms 
R18 — 470 ohms 
Capacitors 

Cl, C5, C6. C9— 2-10 pF trimmer 
C2-C4, C7, C11, C14, C25— 470 

pF, chip 
C8, C20, C26, C27— 0.01 |j.F, disc 
CIO— 0,6 pF (must be handmade, 

see text) 
CI 2—1 pF, NPO disc or chip 
C13— 3.3 pF, NPO disc or chip 
015— 10 \lF, 16 volts; electroliftic 
016, 018—39 pF NPO disc 
017—68 pF NPO disc 
019—470 pF, disc 



S COMPONENT SIDE FOIL PATTERN. 



021-18 pR NPO disc 

022-56 pR NPO disc 

023—10 pR NPO disc 

024—470 jjtR 16 volts, electrolytic 

Semiconductors 

D1 , D4 — 1 N757A Zener diode 

D2— MV2103 varactor diode 

D3— 1tM4007 diode 

Q1— 25137 GaAsFET (NEC) 

02— MPSH81 NPN transistor 

Q3— 2N3663 NPN transistor 

Other components 

L1-L3— 3 turns of 20 AWG tinned 

wire (approx. 0,025 \xH, see Fig. 

5) 
L4 — part of PC board etching, see 

text 
L5— 18 [jlH RF choke 
L6. L7— 8 turns of 22 AWG enam- 
eled wire wound on No. 8 screw 

(approx. 0.095 m-H, see Fig. 5) 
L8— 9'/2 turns of 22 AWG enameled 

wire wound on No. 8 screw, with 

ferrite slug (see Fig. 5) 
Ml— MCL SBL-1 mixer 
J1, J2 — F connector 
Miscellaneous: PC board, ¥i6-inch 

copper- foil tape, coaxial cable. 

project case, 12.6-volt DC power 

supply, solder, etc. 
Note: The following items are 

available from North Country 




Radio, P.O. Box 53, Wykagyi 
Station, New Rochelle, New 
York 10804: 

• A kit of parts to build the 
downconverter (includes PC 
board and alt parts that mount 
on it, J1 and J2, and wire to 
wind all inductors (metal case 
and power supply not in- 
cluded)— $59.50 ^ $3.50 S&H 
(Note that none of the parts 
shown in Fig. 3 are included 
with the downconverter kit.) 

• Metal case as shown — 
$12.50 

• 2-watt ATV transmitter kit 
with a 439.25-MHz crystal (see 
Radio-Electronics, June and 
July 1989>— $110 f $3.50 S&H 

• A 0.5-watt, 9-volt transmitter 
kit with a 439.25-MHz crystal— 
$112 + $3.50 S&H 

• Linear amplifier kit to boost 
the output of ATV transmitter to 
15 watts (see Radio-Elec- 
texjnics, August 1992) — $79.50 
+ $3.50 S&H 

• Crystals (or channels 14, 15, 
16, 17, or 18 (for test purposes 
only)— $7.50 each 

New York residents must add 
sales tax. _ 




111 



SOLDER SIDE FOIL PATTERN. 



82 



for the base of Q2, and R9 pro- 
vides emitter bias. Nominal cur- 
rent through Q2 is about 5 to 6 



milliamperes. Capacitors C12 
and C13 provide a feedback net- 
work for 92. 



Components C9 and L4 (a 
length of microstrlp line etched 
on the PC board), together with 



3 and varactor diode D2, 
m a circuit that can be tuned 
. the bias on D2 over the 
ige of 350 to 390 MHz, de- 
riding on the setting of C9, 
lerefore, 92 will oscillate over 
at frequency range, because 
■sitlve feedback is provided by 
.2 and C13, and Q2 acts as a 
ounded-base amplifier. Os- 
Uator output is taken through 
17 and R12 to mixer Ml. The 
vel at terminal L of the mixer is 
30ut 0.3 volt RMS. Resistor 
11 is connected to a tap on L4, 
•hich also provides bias return 
)r the collector of Q2, because 
; is at DC ground. 
The output from mixer Ml at 
iO to 70 MHz (the difference fre- 
quency between received signal 
ind L.O. frequency) appears at 
"Dixer terminal X. There is 
ibout a 7-dB loss in the mixer. 
3oil L5 provides a DC return for 
the mixer IF port. A low-pass iil- 
ter made up of C16. L6, C17, L7, 
and C18 eliminates any remain- 
ing UHF signal components ap- 
pearing at terminal X. Tran- 
sistor Q3 is an IF amplifier 
stage, which is biased by R13, 
R14, and R15 to a V^k of 8 volts 
and a collector current of about 
8 mA. Tuned circuit L8, C21, 
and C22 can be tuned to either 
channel 3 or 4. The signal from 
the low-pass filter is coupled to 
Q3's base via C 19. 'h-ansistor Q3 
provides about a 15-dB gain; its 
output signal appears at J2. 
Power for the downconverter is 
supplied through D3, which 
protects against reverse volt- 
ages, and C24 and C26. which 
bypass EU*" and noise. 

Resistor RIO couples DC bias 
to D2 supplied from tuning-po- 
tentiometer R14. Components 
R16, D4, and C25 provide 9- 
volts DC for that purpose. If de- 
sired, RIO can be supplied with 
external DC for remote-control 
tuning, or to allow the down- 
converter to be mounted close to 
the antenna. That is commonly 
done to reduce transmission- 
line losses between the antenna 
and converter — tosses run high 
at 450 MHz unless very expen- 
sive transmission line, such as 
'/a-inch hard line, is used. If you 
are planning on remote-control- 
ling the converter, install R14 so 
it's easy to move. 




FIG. 5 — COILS L1, L2, AND L3 are thr€« turns each of 20 AWG tinned wine wound 
around a No, 6 screw and stretched to 0.3 inch. Ttie lead Irom J1 has Its center 
conductor soldered to L1 at V* turn from the grounded end. Resistor R5 is soldered VA 
turns from the end of L2 that connects to R6, C7, and C8. Coil L3 Is tappied at 1 turn from 
the grounded end. Colls L6 and L7 are 6 turns each of 22 AWG enamelled wire wound 
on a No. 8 screw. Coll L8 is 9^ turns of 22 AWG enamelled wire wound on a No. 8 screw 
with a ferrite tuning slug added. 




I 
I 

m 



RG. 6— ALL CHIP CAPACITORS, CIO (see Fig. 8), and Q1 mount on the solder side of 
the board. The markings on 01 face the component side of the board. 





GHOLE 



Z 



7'/isF0ILTAPE-* 



PC BOARD 



\ 



SOLDER 



WRAP FOIL TAPE 
AROUND EDGE AREA OF PC 



i—^VT^ 



BOARD AND SOLDER ALL AROUKD, 



I 

I 



HG. 7— ALL HOLES MARKED "G" in Fig. 4 must have jumper wires passed through 
them that are soldered on both sides of the PC board as shown here. Also, both sides 
of ttie board must be grounded together with copper-foii tape as shown. 



FILE THIS EDGE TD 
REDUCE CARACrrANCE 




PCBO^UVD 



FIG. 8— TO MAKE CIO, take a small 
square of G-10, 0.062'inch PC board ma- 
terial and trim It to a ^s-lnch square. In- 
stall it on the solder side of the board In 
the location shown in Fig. 6. 



FIG. 10— PEAK THE CONVERTER for a 
response as shown here. By trimming 
C10 with a file you can experiment with 
the coupling and resultant bandpass 
shape. 



I 

S- 

I" 



UJ 
84 




FIG. 9— THE AUTHOR'S PROTOTYPE. The converter should be mounted in a metal 
box, weatherproof if outdoor use is intended. 



Figure 3 shows how J2 can be 
connected to a long coaxial 
transmission line that runs to 



the ATV receiver station. The ca- 
ble is isolated from ground and 
can therefore carry a DC volt- 



age. The DC voltage is Im- 
pressed on the cable as follows: 
A nominal 26 -volt power source 
at the ATV receiver station is 
connected to 97, a 2N2222 NPN 
transistor used as an emitter- 
follower. Resistors R22 and R23 
produce a variable voltage of 14 
to 26 volts at the base of Q7. 
whose emitter will follow the 
voltage. Power is supplied to the 
cable through Lll, and by vary- 
ing potentiometer R23, the volt- 
age applied via R22 to the cable 
at J3 can be adjusted between 
14 and 24 volts. Capacitor C35 
prevents any DC voltage from 
appearing at J4. 

The DC voltage is taken off 
the cable via the ISjjlH RF choke 
LIO. Capacitors €30 and C31 re- 
move noise from the DC voltage 
and provide an RF ground. 
Positive voltage is fed to the 
downconverter via the cable's 
center conductor and the outer 
shield serves as the negative 
supply lead; it is grounded to 
the case and ground foil. 

The DC input is fed to D6, a 
12-volt Zener diode (a 1N759 
can be used). Capacitors C33 
and C34 filter any noise from 
the voltage which will be 12 volts 
less than the voltage on the 
coaxial transmission line ( -I- 14 
to +24 volts), or +2 to +12 
volts DC, That is fed to RIO. 
which feeds the tuning voltage 
to the downconverter varactor. 
By vEirying the DC voltage on the 
transmission line between + 14 
and + 24 volts, not only can the 
downconverter be powered, but 
it can be remotely tuned to a 
desired frequency as well. 

Note that the components 
shown in Fig. 3 are not part of 
the downconverter board, and 
they are used only if remote op- 
eration is required. 

Construction 

The PC board material (G-10, 
0.062 inch thick glass epoxy) 
and layout must be followed ex- 
actly to duplicate the perfor- 
mance of the downconverter. 
The stray capacitance, coupling 
between elements, and L4 are 
all Integrated into the design of 
the board. Any layout devia- 
tions can change those specifi- 
cations. The foil patterns are 
continued on page 109 




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!liMiWJH:IJ!lil.lH3: 




Apple's PhotoGrade, electronic halftones, consultants network, 
marketing your ideas, and two great new books. 



DON LANCASTER 



Oh, the times, they are a- 
changing. We seem to 
have a mix of really bad and 
jatly awesome stuff coming down 
itely. Let's start off with some of 
16 sadder vibes... 
Heath kit has recently discon- 
nued production on most of its 
ilectronic kits. It's the end of an era 
or sure. 

But a funky little outfit called 
viusty Manuals is setting out to 
stock and make available all of 
hose older Heath assembly books 
and instruction manuals. And lots of 
exciting hacker kits are being made 
available from such outfits as PAIA, 
Old Colony, and Micro Mint. Plus, 
Df course, through several of the 
advertisers in this magazine. 

The technical paperback book 
field (especially the non-computer 
titles) is clearly not well. Sams is 
essentially gone, bought out by 
Macmillan and triaged into an eth- 
ereal shadow of what once was the 
most respected and diversified 
technical book publishers in the 
world. TAB has been purchased by 
McGraw-Hill and become a subsidi- 
ary. I have been getting plenty of 
helpline complaints about several 
sources that offer dated and inaccu- 
rate titles. Believe it or not, your IRS 
is now paying publishers to shred 
books, especially old technical pa- 
perbacks, through an obscure in- 
ventory ruling that has totally 
decimated long-term back lists and 
older technical titles. 

But — an incredibly exciting new 
opportunity called Book-on-de- 
mand publishing is emerging in 
which you can produce first-quality 
paperback and hardback books lit- 
erally on your kitchen table when 
and as they are ordered. With a "for- 
ever" backlist, no IRS inventory 
penalties, and no lower limit to the 
total number of sellable volumes 
needed. And it also includes such 



exciting possibilities as a 90-per- 
cent author's royalty and rapid CD- 
ROM distribution. Much more on 
this on GEnie PSRT. 

Very alarmingly, some community 
colleges are cutting back on or out- 
right eliminating their electronics 
departments. And many electronic 
service and repair trade journals 
have vanished without a trace. 

But — we now have got the richest 
and most incredible variety of cheap 
new chips to play with. Anywhere. 
Even We have major breakthroughs 
in hacker direct-toner printed cir- 
cuits. We have a brand-new Elec- 
tronics Now format with new 
features and fresh ideas that con- 
tinues the oldest ongoing elec- 
tronics magazine publishing house. 
And we are something like a scant 
eight years away from hardware that 
can surpass the human brain in logic 
and analysis capabilities. 

Right now is certainly the great- 
est time everto be getting into hard- 
ware hacking in a very big way. 

Electronic halftones 

I've recently been playing around 
with the new LaserWriter G and am 
very impressed with its new ability 
to print medium- to high-quality pho- 
to halftones. So, I thought we might 
review what is involved in the laser 
printing of photos in general, and 
see Just why Apple's neat 
PhotoGrade process seems to beat 
out brute-force methods — and how 
we can do even better. 



NEED HELP? 



Phone or write your Hardware 
Hacker questions directly to; 

Don Lancaster 

Synergetics 

Box 809 

Thatcher, A2 85552 

(602) 428-4073 




Many of those previous -genera- 
tion laser printers were 300-DPI de- 
vices, capable of placing or not 
placing 300 whole dots per inch uni- 
formly along any one selected laser 
scan line. That translates to 90,000 
dots per square inch, or a tad over 8 
million dots on a standard page. If a 
dot is only black or white, it can 
usually be represented on the page 
bitmap or in your frame device as a 
single bit. Thus, around a megabyte 
worth of memory must be reserved 
for your full-page bitmap at 300-DPI 
rBsolution. 

The obvious big dilemma in rais- 
ing your laser-printer resolution is 
this: As you go from 300 DPI to 
1200 DPI, you could end up requir- 
ing sixteen times the memoryl And 
your page makeup times could end 
up sixteen times as long! Yet 
"more" resolution is perceived to 
be a big user need. Or is it? 

Actually, laser-printing resolution 
is pretty near as highly overrated as 
Peterbilt trucks or teenage sex. But 
that's another story for another 
time. I strongly feel that higher reso- 
lution is not worth losing genuine 
Adobe Level II PostScript, duplex 
printing options, low per-page print- 
ing costs, mainstream technology 
good third-party supply sources, lo- 
cal hard-disk support, or any sleep. 

A poorly scanned photo (or one 
that's not properly histogram equal- 
ized) will end up looking even worse 
on the premium machines. 

One zero-cost way to increase 
your printer's resolution when you'd 
like "camera ready" art for conven- 
tional printing: Just work oversize 
and then photoreduce. Most of my 
Hardware Hacker figures are 
printed at 133 percent normal size 
and are then reduced here for an 
effective resolution of a scant 400 
DPI, Yet I feel they look as good as 
most of the other technical hgures. 

An easy way of making a 300-DPI 



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FIG, 1— A LASER PRINTER can fake a halftone by grouping dots into a larger "cell." In 
this example, a 3 x 3 pixel array forms a cell that can have ten gray levels, including 
black and white. On a 300-DPI printer, this would form a "100 line, degree" halftone 
screen. 






I 

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printer look better Is to do a plain old 
smoothing job. That concept was 
pioneered by Hewlett-Packard as 
Resolution Enhancement Tech- 
nology. 

Apple (and many also-rans) have 
copied this idea. On the LaserWriter 
G, Apple calls it FinePrint. 

The smoothing is .done by a 
custom integrated circuit that inter- 



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DON LANCASTER 



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Midnight Engineering Reprints 16.50 
Incredible Secret Money Mschlne 1B.50 
CMOS Cookbook 24. SO 

TTL Cookbook 24.50 
Active Filter Cookbook 19.S0 

Micro Cookbook vol I or II 19.S0 

Lancaster Classics Library 119.50 
AppleWrllei Cookbook 19.50 

POSTSCRIPT STUFF 

Ask The Guru Reprints I, II or U1 24.50 

LaserWriter Secrets (lle/Mac/PC) 29.S0 

PostScript Show & Tell 39.50 

Intro to PostScript VHS Video 39.50 

PostScript Beginner Stun 39.50 

PostScript Cookbook (Adobe) 16,50 

PostScript Ref. Manual II (Adobe) 28.50 

PostScript Program Design (Adobe) 22.S0 

Type 1 Font Format (Adobe) 15.60 

LaserWriter Reference (Apple) 19.50 

Real World Postscript (Roth) 22.50 

PostScript Visual Approach (Smith) 22.50 

Thinking in PostScript (Reld) 22.50 

Undst PS Pgrmmg (Holtzgang) 29.50 
TheWholeWorks(allPostScripl) 349.50 

BOOK-ON-DEMAND STUFF 
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Box 80g-RE 

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cepts and stores a few of the scan 
lines on their final way out to the 
laser scanner. By analyzing a matrix 
formed from the nearby dots on ear- 
lier and later lines, certain dot posi- 
tions are delayed by one-half a dot, 
following a smoothing algorithm. 
The result is a really big improve- 
ment in most typography and some 
graphics, especially for reproducing 
slanted lines. 

Despite all the hype, the circuitry 
involved is simple and cheap. And it 
can end up totally independent of 
the imaging model or language in 
use. 

But plain old smoothing can 't help 
halftone photos, and it may even 



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17 grays 



73 SPI, 14 degrees 71 SPI, 45 degrees 
18 grays 19 grays 



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£3 SPI, 46 degrees SO SPI, 31 degrees 50 SPI, degrees 49 SPI, 10 degrees 
33 grays 35 grays 37 grays 39 grays 

FIG. 2— THE AVAILABLE SPOT PATTERNS for a typical 300-DPI PostScript printer. 
Note that these are the ONLY dense patterns available. You'll get one of these re- 
gardless of what you ask for. Note the perfect tiling. 



rt. Let's look further at... 

le halftone process 

There is only one method to print 
mething that is truly gray on the 
ge. And that is to use gray ink. 
id each different shade of true 
ay will need a different gray ink 
id another pass through the print- 
3 press. Since this is clearly not 
)od, printers have long used a 
s/ftone process instead. 
The halftone process consists of 
inting lots of different-sized biack 
Dts very near to each other The 
Dts are carefully spaced to be less 
lan the eye's angular resolution, 
istead of seeing the individual 
ots, your eye averages out the 
lack dots and the white back- 
round and perceives an average 
ray level. The higher the ratio of 
vhite to black, the lighter the gray, 
ind vice versa. Let's try it out. Look 
it a gray portion of any black and 
vhite photograph or tint box in this 
nagazine. While it looks gray with 
he naked eye, under a nnagnifying 
3lass you'll see all the little dots that 
nake up the halftone. The dots are 
all black. 

To print any photograph, a special 
screen is used on the litho camera 
to convert gray values into collec- 
tions of black dots of varying size. 
Traditional printers will spec their 
screen size as the number of half- 
tone spots per inch. Some popular 
ones include 85 spots per inch for 
tabloid news and the 120 spots per 
inch for most magazines of Elec- 
tronics Now quality. 

Even higher spot densities are 
used on premium magazines. But 
they require special inks, coated pa- 
pers, and extreme attention to de- 
tail . Note that even the highest spot 
densities used are nowhere near 
300 spots per inch! 

A second halftone parameter is 
called the screen angle. It turns out 
that the human eye is very good at 
picking out horizontal and vertical 
lines, but rather poor on resolving 
diagonals. Since the halftone pro- 
cess introduces visual artifacts, it is 
often best to set your black-and- 
white screens on a 45-degree an- 
gle. In color printing, the halftone 
screen angles become even more 
critical if they are to eliminate objec- 
tionable Moire patterns. 



Several methods can be used to 
fake halftone screens on laser 
printers. One method is to group all 
the possible laser dot positions into 
larger spots that I'll call a cell. Figure 
1 shows you how a 300-DPI printer 
can use nine dots to make cells of 
100 spots per inch. This particular 
cell has a screen angle of zero. As 
you can see, there are ten possible 
gray levels here, including black and 
white. 

We can immediately see that we 
could use 36 dots to form 50-spot- 
per-tnch cells. And those cells 
would give us 37 possible grays. 
Clearly, we have a tradeoff between 
the number of cells per inch and the 
number of available grays. Use too 
few cells per inch, and you'll end up 
with the "Sunday Funnies" effect 
with very grainy dots. Use too few 
grays, and you will so/anze with ob- 
vious (and often objectionable) 
steps between each possible gray 
level. 

The gray-level resolution of your 
eye depends on context and con- 



trast, but a number slightly over 256 
gray levels is possible. But, be- 
cause of the stupendous costs of 
exceeding 256 grays, most experts 
agree that eight bits of gray scale 
resolution is enough even for pre- 
mium images. Television some- 
times might get by with as few as six 
bits, good for a mere 64 gray levels. 
The obvious next question is 
"How good can our halftones image 
at an unenhanced resolution of 300 
DPI?" Ignoring the obvious answer 
of "Not good enough," we'll then 
go on to ask ' 'What can we do about 
it?" 

PostScript to the rescue 

I have found that the FbstScript 
general-purpose computer lan- 
guage has some really great ap- 
proaches to electronic halftones. 
Those involve their setscreen and 
image operators, among many 
others, PostScript uses some imag- 
ing tiles that determine the screen 
angles and frequencies. Since 
these screen tiles must all abut 



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each other perfectly and still must 
obey integer (whole numbers only) 
math, there are very definite limits 
to which 300-DPI tiles are and are 
not possible. If you ask for some 
halftone cell angle or frequency that 
is simply not physically possible. 
PostScript will substitute the near- 
est handy one. 

Figure 2 shows you the available 
denser halftone cells as used on 
most popular 300-DPI PostScript 
printers. Figure 3 shows you the 
secret gray map for all of the "hid- 
den" PostScript grays. 

Typical PostScript users and 
nnost applications packages blindly 
insist on using the seventeenth 
most putrid PostScript gray avail- 
able. While this is often incomectly 
called a 60-DPI screen, its effective 
resolution is only 53 dota per inch. 
There are 33 grays with this default 
screen. 

That sort of explains the "Sunday 
Funnies ' effect of most pooriy done 
PostScript screens. And one of the 
biggest reasons why people feel 



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they need "more" resolution. When 
in fact, their grays can all get in- 
stantly and dramatically improved 
by using a few dozen keystrokes! 

Ferinstance, the best PostScript 
300 DPI halftone screen for typical 
graphics is a 106 DPI, 45-degree 
one which gives you absolutely 
beautiful grays. Sadly, you'll only get 
ten of those grays, but the lightest 
ones are very good for graphics. 

Two other quite useful 300 DPI 
secret PostScript grays of interest 
are the 85-line and 35-degree "re- 
progray" useful for oversize cam- 



era-ready art, and the 135-line. 2 
degree "india ink wash" gray Tl 
latter gives you only six gray leve 
and requires a careful selection 
toner and paper But the results a 
stunning. 

One way to do a best PostScri 
gray is to enter these keystrokes i 
PostScript commands... 
106 45 dup mui exch dup mul 
add 1.0 exch sub setscreen 

The first number is your cell fr 
quency; the second is your angi 
The details of where and how yt 
enter these code lines depend c 





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26 


27 


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18 










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135 




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140 














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175 












210 














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300 


2 










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5 10 15 20 25 30 35 40 45 
Screen angle in degrees 

RG. 3— THE TOP SECRET GRAY MAP for a 300-DPI PostScript printer. Hflost users and 
most appiication packages insist on using the seventeenth most putrid of the avail- 
able grays. The best graphics gray is 106 DPI at 45 degrees. 



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Old 300 DPI 

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(100 DPI, degree halftone cell shown) 

=IG. 4— BOTH QMS AND IBM/LEXMARK chose the "brute force" 600-OPI method to 
mprove tfieir PostScript photo halftones. The original 100-DPI spots allowed 10 gray 
evels; the new ones allow 37. There is a 4x speed and 4 x memory penalty for the 
nodest (t)ut certainly welcome) improvement. 




■8" bitmap '4' bitmap "2' bitmap "I" bitmap 

(100 DP), degree halftone cells shown) 

FIG. 5— THE APPLE LASERWRITER G remains at 300 DPI, but it uses four bitmap 
memory planes that allow one of sixteen pixel dot sizes. That permits 144 gray levels at 
100 DPI for good- to better-grade photo halftones. Or 128 gray levels at the more 
popular 106 DPI and 45 degree screen. 



your PostScript programming style 
or the applications package you 
have. Call me if you need any further 
help on this. 

No, none of those screens can 
give you any high-quality halftone 
photos. But the 75-line screen can 
give you a recognizable "auto shop- 
per" quality photograph. Especially 
if the scanned image has been prop- 
erly histogram-equalized. 

Three key points: The halftone 
dots used in everyday printing are 
much coarser than 300 DPI, Some 
excellent graphic PostScript grays 
are available at 300 DPI. They need 



only a few dozen simple keystrokes 
for their activation. And our halftone 
photo quality, when given any prop- 
erly image processed input, doesn't 
miss by that much. 

So we can potentially add only a 
little to 300 DPI and gain enor- 
mously on halftone photo quality. 
Both QMS and IBM/Lexmark 
picked the brute force method. As 
Fig. 4 shows us, they switched to a 
600-DPI double tBSolution and then 
swallowed the 4:1 speed and mem- 
ory penalties. At 100 cells per inch, 
you now have 37 gray levels. Or 50 
gray levels at an 85-ceils-per-inch 




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density. That could make the dif- 
ference between lousy and not tialf 
bad photo halftones. Especially 
given a proper digital image pro- 
cessing. 

Apple has chosen the more ele- 
gant PhotoGrade method shown in 
Fig. 5. They remained at 300 DPI, 
but added three extra bitmap mem- 
ory planes for a total of four Then 
they modulated their laser dot size 
to one of sixteen values. You now 
can have sixteen times as many po- 
tential gray levels as you did at 300 
DPI with only a single memory 
plane. At 106 DPI, you now have a 
much better 129 gray levels avail- 
able. That is equal to a brute force 
resolution of 1200 DPI! 

There is only a negligible speed 
penalty, since all four memory 
planes are written in parallel by 




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custom-designed LSI chips. And 
white you retain the same 4 x mem- 
ory penalty as a brute force 600 x 
600, you'll get four times the effec- 
tive resolution! 

The result? Good to better photo 
halftones out of any plain old 300- 
DPI laser-printer engine. Especially 
with premium toner and properly 
scanned image processing. The 
PhotoGrade is also upgradable on 
older NT and NTX printers with a 
simple plug-in board. 

Can we do better? 

I think we can. At least in theory. 
For any 100-spot-per-inch tile at 
plain old 300 DPI, we are using nine 
bits to call out only 10 different spot 
values. Since nine bits could repre- 
sent 512 different state values, the 
memory use efficiency is a tad un- 




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der two percent. Wowie gee! 

The PhotoCrade does 
ridiculously worse. Here we are ask- 
ing 36 bits to call out a mere 144 
different gray levels. Since thirty-six 



bits can yield us up to 
68,719,476,736 different states, 
our memory use efficiency is essen- 
tially zero! Thus, virtually all of that 
Apple PhotoCrade memory bitmap 
is totally wasted! 

Instead, let's go back to, say, 100 
spots per inch at a plain old 300 DPI. 
Once in the center of every desired 
halftone spot, put out a single laser 
dot having 512 possible size values. 
Presto. A mind-blowing total of 512 
grays at 100 DPI; Or a perfect 256 
grays up at the usual 106 DPI! This 
is for photo halftone dots only; you 
would still be able to do special 
screens and weird spot functions 
the old way. Patterns, too. 

For us to make full use of what 
seems theoretically designabie, you 
would need some special automatic 
mode sensing for the halftone 
areas. And a diamond-shaped laser 
beam whose diameter could be 
controlled over a 25-decibel or 16:1 
range. Down from a maximum 
slightly under three times larger 
than is now used. None of those 



needs seems a really big deal. 

Thus, it should be theoretically 
possible to build a 300-DPI 
PostScript laser printer with out- 
standing photo halftones. A 1697- 
DPI equivalent. At zero speed or 
memory penalties. Hmmmm... 

1 have posted lots of halftone and 
secret gray study examples to 
GEnie PSRT, especially my files 
129, 141. 144, 179, 180, 231, and 
239. I've also uploaded some high- 
quality images that you can play 
with, either inside or outside 
PostScript. In particular, check out 
LENA.PS, MANDRILL.PS, and my 
enhanced LENAH1ST.PS. 

Marketing your products 

1 was pleasantly surprised to find 
that the leading invention marketing 
firms are now publishing their track 
records — up front in their initial mail- 
ings. One of the oldest and largest 
discloses: Of the ideas submitted 
and contracted, the odds of getting 
a royalty license are 100:1 against, 
continued on page 93 



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91 



AUDIO UPDATE 



Format future shock 







E 
t 



C 

9 



92 



Are we lost in a forest of new 
audio formats? Is there a fu- 
ture for DAT, DCC, and the 
mini disc — not to mention record- 
able CDs? 

I have always considered myself 
relatively immune to the effects of 
"Future Shock." As you may recall, 
the dreaded FS Syndrome de- 
scribes the disturbed and disori- 
ented behavior of those suffering 
input ovedoad brought on by too 
many life changes happening too 
fast. 

Students of sociology are aware 
that the organization of any society 
roughly reflects the way that the 
people in it make their living. And 
the kind of work that people do, in 
turn, derives from the technological 
level of the society. Since tech- 
nology is cumulative, it follows that 
change, for better or worse, is inev- 
itable. (I could cite historical data for 
all this, but for the sake of argu- 
ment, just take my word for it). It has 
been suggested in other contexts 
that the way to deal with the inevita- 
ble is to relax and, if possible, enjoy 
it. But for many audiophiles, their 
fun is threatened by the proliferation 
and confusion of many competing 
formats. 

All this is by way of a psycho- 
historical introduction to the pres- 
ent state of home audio electronics. 
In past articles I've looked at the 
question of new formats and exam- 
ined the factors that make them into 
hits or misses. As I see it. the major- 
ity of audio consumers are most in- 
terested in a format's convenience 
and only secondarily in its fidelity. 
Although I certainly don't discount 
the very low distortion and noise- 
free qualities of the CD format, its 
obvious attractions — for the aver- 
age consumer — mostly reside in its 
durability and convenient handling. 
My evidence for all this is the fact 



that several years ago the compact, 
convenient-to-use, and relatively 
rugged prerecorded cassette start- 
ed to outsell LP's despite the LP's 
superior sound quality and lower 
price. For the same reasons, the 
latest figures show that CD's are 
now outselling cassettes in dollar 
volume. Next year's figures will 
probably show superior sales in ab- 
solute numbers as well. 

What does all this tell us about 
the relatively sudden proliferation of 
new audio formats — and consumer 
reactions to them in the past several 
years? Are the Japanese (and 
others) engaging in a strange rite of 
mutual commercial throat-cutting? 
For example, no sooner did the CD 
format establish itself than digital 
audio tape (DAT) was introduced. 
Although the two formats were not 
really competitors any more than 
LP's and open-reel tapes were, con- 
sumer confusion was rampant. And 
consumers stayed aw/ay from the 
DAT format in droves! 

Then, in 1986, the word was out 
that various companies were work- 
ing on a recordable CD. About four 
years ago one company held a 
press conference during which it 
was claimed that their digital record- 
er/player would be on the market in 
about two years — and would cost 
less than $500! It didn't happen 
then, but recently Carver and Philips 
announced the imminent release of 
a new breed of compact-disc re- 
corders. A clue to the target market 
for the machine is given in the Car- 
ver press release: "Professional 
user net price of the PDR-10 is un- 
der $8,000." In truth, I don't have a 
feel for the professional in the re- 
cording industry, but audio consum- 
ers are not likely to be waiting in line 
to invest so heavily in an un proven 
product with (for them) somehwat 
obscure advantages. 



Planned obsolescence? 

Over the years, I've occasionall 
defended the hi-fi industry again j 
the recurrent charge of engaging i 
"planned obsolescence." The cor 
version from 78 's to LP's, tubes t 
transistors, mono FM and record 
to stereo all struck me as wortf 
while advances in the audio ai 
rather than nefarious plots to se 
new products. With today's tech 
nologies I'm not so sure. 

Is Japan so filled with tech 
nologically obsessed marketer 
that they compulsively create nev 
audio formats oblivious to consum 
er needs and reactions? Is thel 
guiding philosophy something lik( 
the classic advertising agency ap 
proach, "Let's run it up the flagpolf 
and see if anyone salutes."? If sc 
it's an expensive and frequently sell 
defeating way to run an industry. 

Several years ago, the consumer 
electronics trade publication Twici 
ran an interview with fHiroki Shimizu 
general manager of JVC's Persona 
Audio Products Division. Mr 
Shimizu's comments were so star 
tlingly different from the usual self 
setving presentations heard at new 
product press conferences tha 
they are worth quoting. Shimizu was 
troubled by what he called the eth 
ical C!) aspects of today's prolifera 
tion of formats. He suggested tha' 
the industry was coming out witf 
too many products too fast withou 
considering the interest — or bes' 
interests — of the consumer DAI 
technology, according to Mr 
Shimizu, came too fast and the ap 
plication came later; as a result the 
market has not taken off. The ap 
plication should come first, he said 
In his view the most important thine 
is how the new product will fit intc 
the market. 

Other voices of discontent are 
heard in the land, A writer in The 




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New York Times suggested that the 
proliferation of competing formats 
is part of a conspiracy involving 
Sony (CBS Records), Matsushita 
(MCA Records), and Philips to 
somehow protect their record-com- 
pany royalties from the predations 
of rabid home recordists. (If the re- 
cording machines don't sell be- 
cause of consumer confusion, they 
won't be used to copy cop/righted 
material.) However, it seems im- 
probable to me that the music and 
audio-product divisions of a compa- 
ny would play those sort of internal 
games with so much cash and pres- 
tige on the line. 

Future formats 

Do I have any advice to offer 
those seeking to keep their heads 
above water in the flood of new au- 
dio products? For one thing, read 
the articles extolling the virtues of 
this or that new format with a critical 
eye. Remember that most writers 
and editors believe that readers are 
automatically turned on by the New.' 
Experience has shown, however, 
that large numbers of excited words 
devoted to the advent of a new au- 
dio format don't reliably predict its 
success. 

Given the snowballing of tech- 
nology, it's hard to make predic- 
tions, but certain developments 
seem inevitable. In a science-fiction 
story I wrote in 1977, 1 predicted that 
the turn of the century would see a 
fiber-optic cable that linked most 
homes in America. Among its many 
services would be the ability to call 
up any musical composition, pop or 
classical, from the world's recorded 
library. Separate musical software 
as such would be obsolete, as 
would, of course, the players that 
deliver it. I think such a development 
is inevitable, and it would finally put 
an end to all the format she- 
nanigans. Or would it? R-E 



HARDWARE HACKER 



continued from page 91 



and the odds of any positive cash 
flow that exceed costs are 600:1 
againsti 

Those hgures sound about right 
to me. Sometimes I've done almost 
that well on my own. And some- 
times not. Selling an idea is a real 
nDugh row to hoe. One that could 
become a near impossibility if you 
are not a fully trained and well expe- 
rienced insider knowledgeable 
about what is going on in trade jour- 
nals, politics, economics, and the 
tech literature of the target field. 

An invention-marketing firm is 
just a hired gun, similar to an ad 
agency or a resume-typing service. 
You pay them for their time and 
effort for such services as patent 
searches, listings in product news- 
letters, and participation in inven- 
tion fairs — cash up front. 

As we've seen a number of times 
in the past, the core problem lies in 
the absurd mythology surrounding 
today's patent system. Very simply, 
patents have little or nothing at all to 
do with the selling or marketing of 
an idea. For most individuals and 
most small-scale technical star- 
tups, ariy involvement whatsoever 
with the patent system is virtually 
certain to end up as a net loss of 
time, energy, money, and sanity. 

Just about all hackers will tend to 
grossly overvalue a new idea. At 
one time way back in the golden age 
of inventing, ideas were occasion- 
ally worth as much as a dime a doz- 
en. Today, they are worth less than 
ten cents a bale in ten-bale lots. 
Ideas gain value only when you can 
clearly demonstrate your end users 
actually getting off on them. And 
then only when those ideas are 
already in some saleable, competi- 
tive, promotable, and distributable 
form. 

The key secret to selling an idea 
is very simple: The buyer must 
come to you. For our special re- 
source sidebar this month, I have 
gathered together some ideas that 
can help you to profit from your 
ideas. 

Two essential magazines are that 

Midnight Engineering and the 

continued on page 108 










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VFX 



continued from psige 52 



2! 



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HI 

94 




FIG. 9— THE VFX PROTOTYPE. Carefully check the board for solder splashes and 
bridging before applying power. 



button and the LED display 
should count fast enough so 
that all the segments (an "8") 
appear dimly lit. 

Remove power from the board 
and Install the two RAM's (IC8 
and 1C9). Apply power to the 
board. The LED should again 
display "6," Press the shift 
button and the LED should dis- 
play "0." If any RAM errors oc- 
cur, they will cause the LED 
display to increment. 

Next install 1C3 and 1C5. Con- 
nect your speaker or head- 
phones to J2 and reapply power. 
Press the shift button twice and 
a tone should be heard in the 
headphones or speaker Install 
IC4 and connect a microphone 
to J3. Apply power and press the 
SHIFT button three times. Then 
Speak into the microphone and 
your voice should be heard 
through the headphones. Ad- 
just potentiometers R50 and 
R40 for minimum distortion. 
Now that your VFX board is 
working, you can change the 
DIP switches according to Table 
1 for the other three effects. 

As mentioned before, there is 
a test mode that can help trou- 
bleshoot the VFX processor. It is 
activated by setting the DIP 
switches as shown in Table 1 



and pressing the reset button. 
The test mode individually tests 
the system RAM, the CODEC, 
and the LED display. 

In the test mode the external 
SRAM is constantly written to 
and read, and the number of er- 
rors are displayed on the LED. If 
the LED display is blank and all 
the power supplies are normal, 
there is something wrong with 
the LED or the driver If the LED 
has a number other than zero, 
there might be a problem with 
the SRAM. 

The CODEC data is received 
and immediately retransmitted, 
so the microphone input is 
echoed back the headphones. If 
there is no output or if the out- 
put doesn't sound like the in- 
put, there is a problem. If there 
are no other fault indications 
and the microphone and speak- 
er are working, there might be a 
problem with the CODEC. If 
nothing happens and the power 
supplies are normal, there 
might be a problem with the 
digital signal processing chip or 
the EPROM. 

Where to go &om here 

The VFX processor is intend- 
ed to demonstrate in, an enjoy- 
able way, the capabilities of 



digital signal processing. Th« 
four applications prOgrammec 
into the VFX board are just fouj 
out of many possible applica 
tlons. The VFX processor hard 
ware is capable of belnj 
reprogrammed to perform othei 
functions as well. Some of the 
possibilities are speech recogni- 
tion, active noise cancellation 
voice compression/recording 
and a spectrum-shifting hear 
ing aid. 

For example, the VFX pro- 
cessor could easily recognizt 
the numbers from to 9 anc 
display them on the LED indica- 
tor. That requires that the 
speech be converted into the fre- 
quency domain and the spectra) 
peaks of the sound be compared 
with pre-stored templates. The 
closest matching sound Is se- 
lected and displayed on the 
LED. The processor could then 
generate the DTMF signals foi 
that number to make a voice- 
activated telephone dialer. 

A voice compressor/recorder 
converts an audio input into the 
frequency domain, picks out 
the most prominent spectral en- 
ergies, and stores them in data 
memory as frequency and am- 
plitude. The technique can re- 
duce the amount of data that 
must be stored compared to 
that from conventional digitiz- 
ing processes from 6.5K words 
per second to 650 to 300 words 
per second. The VFX board with 
8K words can record approxi- 
mately 12 to 25 seconds of com- 
pressed speech. 

Active noise cancellation is 
being developed for applica- 
tions ranging from muffling the 
sound of automobile engines 
and industrial machines to 
eliminating the background 
hissing noise in fighter-aircraft 
intercom-system headphones. 
Similar applications for the VFX 
board are being developed. Let 
us know if you have any other 
applications you would like pro- 
grammed into the VFX pro- 
cessor. If you are interested in 
programming your own ap- 
plications, look into the EZ-LAB 
system sold by Analog Devices 
that has been referenced in this 
article. It is an affordable way to 
implement small- to medium- 
sized algorithms.. R-E 




Video scrambling. 




ROBERT GROSSBLATT 



Looking at a line of video on an 
oscilloscope or waveform 
monitor can be a real eye 
pener. As we discuss the various 
ictors involved in video scram- 
ling, you'll need a good under- 
tanding of video to follow along, 
bull also need some equipment to 
iew the waveform, other than on a 
V set. For a good background on 
idea, get your hands on the series 
if Drawing Board columns I did on 
'ideo from January to November 
990. You'll probably be able to find 
hem in your library if you don't have 
he back issues. 

The starting point for any wouid- 
36 unscrambler (hereinafter re- 
ferred to as "us") is that scramblers 
thereinafter referred to as "them") 
start out with a signal that's exactly 
the one we wrant to wind up with. 
Video originates in the clear, gets 
messed up one way or another by 
them, and is sent to us. Our job is 
simply to undo what they've spent a 
lot of money doing. 

You don't have to be a rocket sci- 
entist to mess up video — that is 
true both aesthetically and scien- 
tifjcaliy. The hard part is to do it in 
such a way that you can put it back 
together again. This means that 
there has to be a rigorous ap- 
proach — almost a mathematical 
one — to tearing the signal apart. 

Take a look at — and get intimately 
familiar with — the typical line of vid- 
eo shown in Fig. 1. While most. of 
the time on the line is devoted to the 
picture area, it's the control area 
where the real work is done. The 
signal in the picture area determines 
what you'll be seeing on the screen 
but the stuff in the control area is 
what tells your TV where to put the 
picture and how it's supposed to 
appear 

The control area is blown up in 
Fig. 2, and the information in it is a 
graphed function of time and volt- 
age. By the way, most video people 



like to talk about "units of video" 
rather than voltage for the same rea- 
son that audio people like to talk 
about decibels rather than voltage. 
When the NTSC video standard 
was established, the two most 
basic decisions made were that it 
would range from to 1 volt peak-to- 
peak, and that one voltage range 
would be reserved for picture and 
one would be reserved for control. 
As we go through our discussion on 
scrambled video, I'll talk sometimes 
about video in terms of IRE units 
and other times about voltage. The 

lOOIKE IV 



~4oi/i.e oil- 



two are directly related as shown on 
the Y axis of Fig, 2. 

The bottom line of the picture is 
IRE units which is about 0.3 volts up 
the IRE scale. That point is impor- 
tant because it's both the defined 
level for black video (no picture on 
the screen) and the upper limit for 
any control signals. (Tfiere's a slight 
ambiguity here when you examine 
the colorburst but we'll get to that 
later.) For the moment, we can con- 
sider everything above 0.3 volts as 
picture and everything below that as 
non-picture. 





-cojvr^oi-- 



FIG, 1— TYPICAL LINE OF VIDEO. Mostof the line is devoted to the pi dure area, but it's 
ttie control area that we're interested in. 



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FIG. 2— THE CONTROL AREA. The NTSC video Standard says that the signal can 
range from to 1 volt peak-to-peak. 



95 



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I 






96 



That signal definition is the basis 
for most of the hardwane in every 
NTSC-compatible TV ever made. 
Your TV contains circuitr/ that ex- 
pects control information to be be- 
low 0.3 volts and picture information 
fronn 0.3 to 1 volt. That's important 
because it is the starting point for 
scramblers; when you get rid of 
some of the control information, a 
standard TV can't display the pic- 
tune. Remember that the horizontal 
sync pulse defines the end (or de- 
pending on your point of view, the 
beginning) of a line of video. If the 
TV doesn't see it. it won't know how 
to display the line on the screen, 
and the result will be that the TV will 
end one line and start another one 
at some random point on the 
screen. 

The freewheeling retrace fre- 
quency of the TV will come close to 
the one sent by the broadcaster but 
it won't match exactly. What you'll 
see on the screen will be something 
like Fig. 3. The curved line running 
down the center of the screen is the 
horizontal interval sent by the 
broadcaster 

Three things are happening in Fig. 
3. The first is that the line is cun/ed 
because the horizontal circuitry in 
your TV mns at a frequency that's 
not exactly the same as the broad- 
cast horizontal frequency. The TV 
can accept a certain amount of drift 
in the horizontal frequency. Once 
upon a time a horizontal control was 
built into on the TV so you could 
hand tune the TV to the received 
signal. Although that contnal isn't 
arciund any longer (except some- 
times as a trimmer on a circuit board 
inside the TV), the tolerance is still 
there. Modern TV's can automat- 
ically lock onto the broadcast hori- 
zontal frequency so there's no 
reason for the horizontal contrcil to 
be accessible. 

The second thing that's happen- 
ing is that the line is in the center of 
your screen. The reason for that is 
simple. The TV's horizontal circuit 
uses the received horizontal pulse 
as an instruction to move the beam 
back to the left side of the screen. 
Because the scrambled signal has 
anything but a recognizable horizon- 
tal sync pulse, the TV zips the line 
back to the left side of the screen 
whenever it reaches the right side. 



OF IMAGB. X 










cd^o,e:g.i/sesr 



FIG. 3— A FREEWHEELING RETRACE 
won't match the frequency sent by the 
broadcaster. The curved line running 
down the center of the screen is the hori- 
zontal interval sent by the broadcaster. 



-f-SV ■*- 



•/.SAC 
Q/ 



/N 



/.SK 




k—O 






:E 



V/OCO 
OUT 



FIG. 4— A VIDEO BUFFER isolates one 
stage of hardware from another. The 
transistor is set up as a buffer and the 
level of the video can t>e controlled by 
the value of R2. 

Because that has nothing to do with 
the signal it's receiving, the line usu- 
ally shows up at some random spot 
on the screen. The TV's freewheel- 
ing frequency is close to the broad- 
cast horizontal frequency, so the TV 
will start a new line at about the 
same point in the broadcast tine. 
That means you' 11 see the broadcast 
horizontal interval on each line at 
more or less the same horizontal 
location on the screen. The result is 
a curved line down the screen. 

The third thing happening on the 
TV screen is that the colors are 
messed up. Because the horizontal 
sync is missing, the TV circuitry 
isn't seeing the colorburst in the 
right place, so there's no reference 
for either the intensity or color of the 
picture. The TV then uses whatever 
it sees in the colorburst location as 
a reference for both the intensity 
and color of the image. 

You can see now that by simply 
getting rid of horizontal sync, the 



resulting video signal will be com 
pleteiy messed up. The best way tc 
appreciate that, and a good way tc 
get into video hardware, is to builc 
something to demonstrate how al 
this stuff really happens. That's 
right, our first piece of hardware is 
going to be something that will let 
you scramble video. And, as far as 
thelawisconcemed, I'm pretty sure 
that nobody's going to become very 
upset. 

We'll need a source ot real video. 
That can be anything from an NTSC 
generatorto a line-level video signa 
from the back of a VCR. You'll aisc 
need a scope to look at the videc 
v^veform and a TV to look at the 
picture. You can do without the lat- 
ter but the former is a must. I'm not 
going to beat you up any more about 
getting a scope, but if you don't 
have one, get one. If you don't get 
one, this series of columns, while 
informative, will be somewhat less 
than useful from a practical point of 
view. 

To get started, because we're 
building circuitr/ that is going to use 
an external signal, the first thing we 
have to do is buffer it. That is done 
for two reasons. The first is that we 
have to be able to control the level 
seen by our video circuitry, and the 
second is so that a wiring error on 
the breadboard isn't going to send 
unpleasant voltages back to the sig- 
nal generator or VCR. The results 
could be a bit nasty. 

Video buffers are just like any 
other buffer — they're simple cir- 
cuits that isolate one stage of hard- 
ware from another Think of it as 
being like an electronic fuse. The 
easiest way to build a buffer is with a 
single transistor as shown in Fig. 4, 
The transistor is set up as a buffer, 
and the level of the video can be 
controlled by the value of R2. You 
can also put a potentiometer in se- 
ries on the line feeding the video to 
the base of the transistor and trim 
the level that way. 

Although the NTSC video stan- 
dard calls for a signal that's 1-volt 
peak-to-peak, most VCR manufac- 
turers don't strictly follow that stan- 
dard when it comes to a video 
output signal. If you put the signal 
on a scope, you'll probably find that 
it's a bit higher than that. If that's the 
continued on page 109 





MMJMilitM IILti 1 1 


lMlM.W..i<JI.L<U^^H 


K TKe Cheshire Cat, 


multimedia, and vision. 




I 







i ^ ision, according to the 
^^K American Heritage Elec- 
^m tronic Dictionary, can be 
einned in five ways: 1 . The faculty of 
ight, 2. Unusual foresight. 3. A 
lental image produced by the 
nagination. 4. Something, as a su- 
-ematural sight, perceived thnsugh 
inusual means, 5. One of extraordi- 
lary beauty. 

In the business world, definition 2 
s what people usually think of Ac- 
:ually, definition 3 is most important. 
Arsons with unusual foresight help 
jridge short-term gaps between to- 
day and tomorrow. Persons with 
imagination set long-term goals and 
directions, and inspire others to try 
to move in those directions to 
achieve those goals. Companies 
are typically founded by Type-3 peo- 
ple, and mn byType-2's. 

Starting about 250 years ago dur- 
ing the dawn of the industrial revolu- 
tion, technical vision and imagina- 
tion in the western world focused on 
building tangible items to ease the 
time involved in producing, trans- 
porting, and defending necessities. 
After about 200 years of wide- 
spread social effort, most of those 
pnoblems were solved, so persons 
with visionary imagination shifted 
focus to a different set of problems. 
From these origins was born the 
computer industry. 

Early work in that field centered 
on doing the same kinds of activities 
people had been doing — e.g., ac- 
counting and typing — only faster 
Things started to get interesting 
when Ted Nelson, Doug Englebart, 
and others realized that the comput- 
er had created a whole new world, a 
"virtual" world. Again the American 
Heritage, this time on virtual image: 
An image from which rays of re- 
flected or refracted tight appear to 
diverge, as from an image seen in a 
plane mirror 

There is a virtual world behind the 
CRT, from which mag/nafy light rays 
are diverging, rays that until recently 



were visible only to mathemati- 
cians, computer scientists, and 
software engineers. Now. thanks to 
Nelson and company, and more re- 
cently to video games and the Mac- 
intosh (and let's not forget Micro- 
soft Windows), that Cheshire cat 
image is becoming accessible to 
more and mote people. 

Graphics editors let artists reach 
in and take hold of some of that 
virtual Play-Dough a proprietary 
term. On-line references let writers 
and researchers tap into the knowl- 
edge of the world- Three-D CAD 
programs let architects and product 
designers "build" prototypes with- 
out cutting wood or metal. Medical 
imaging devices let medical techni- 
cians and researchers non-intru- 
sively create images of body parts. 
Serious and popular composers 
use synthesizers to create new mu- 
sical forms. 

Computer technology has pene- 
trated many disciplines, but it still 
has a long way to go. Take video 
editing forone. The traditional meth- 
od for editing videotape and film is 
to do a lot of physical fast-forward- 
ing and rewinding. The efficient way 
to do the job is via random access, 
instantly jumping from any frame to 
any other. Due to the immense stor- 
age required for video information, 
effective random access com- 
pletely dwarfs the storage and bus- 
bandwidth capabilities of today's 
most powerful personal computers 
and low-cost networks. 

Multimedia 

This is where Type-3 vision 
comes in. That vision centers 
around a topic of growing public in- 
terest: multimedia. Don't be misled 
by popular computer, video, and 
games magazines. Multimedia is 
not just putting a sound board in a 
PC, or adding a CD-ROM drive to a 
Nintendo, The real promise behind 
multimedia is twofold: DTo bring the 
whole world into that virtual image 



behind the CRT, and 2) To connect 
your virtual image to mine and ev- 
eryone else's. 

The requirements for rich multi- 
media are simple: 16-bit audio, full- 
screen 30-frame-per-second video, 
24-bit (photographic-quality) imag- 
ing, fast access to lots of textual and 
numeric data — all of which must be 
available on-demand, syn- 
chronously, instantaneously at any 
time, and Ceventually) anywhere in 
the world. 

!t would take a powerful main- 
frame to provide that kind of ca- 
pability today On the other hand, a 
run-of-the-mill 486 today exceeds 
the computational power of a main- 
frame of a decade ago. Assume 
then that within the next decade, 
"computers" that meet those re- 
quirements become available. 
Those "computers" will have built-in 
general-purpose digital signal pro- 
cessors (DSP's) for compressing 
and decompressing audio and video 
data, and for doing fax and modem 
chores as well. Semiconductor 
memory will be measured in the 
gigabytes, and permanent storage 
will be measured in the terabytes 
(on personal computers; main- 
frames will have even more). Optical 
storage may finally, after decades of 
promise, become cost effective. 

Tomorrow's computers will have 
built-in connectivity to office sys- 
tems, commercial databases, enter- 
tainment banks, and interactive 
educational courseware. Transmis- 
sion speeds of these new networks 
will make Ethernet and Token Ring 
look like box turtles. 

Those systems will have built-in 
docking technology (both hardware 
and software) for portable notepad/ 
planner systems based on today's 
fledgling pen-input technology. They 
will have lightweight, flat, high-reso- 
lution, true-color displays — and 
printers — and will accept keyboard 
and pen input indiscriminately. They 
will communicate via a universal dig- 



i 

I 
m 
a 
o 

3 



97 



i 
I 



tu 
98 



ital communications system that will 
probably come about as some soil 
of joint venture between AT&T, the 
cable TV companies, the indepen- 
dent networks CCNN, FNN, Fox), 
media giants like Time-Wamen and 
major computer companies. 

There will be gobs and gobs of 
data flowing around, and lots of con- 
fusion about who owns rights to 
what. New kinds of copyright issues 
will keep lawyers busy for the next 
century. Students and researchers 
will have unprecedented oppor- 
tunities to cheat. Illegal data tapping 
and decoding Cakin to today's cable 
TV descramblers) will provide a data 
underground and new forms of law 
enforcement (the Data Police). 

That technology will not replace 
today's TV. VCR, stereo system, 
video game, fax, telephone, or com- 
puter. However, those technologies 
will come to be seen as modular, 
interoperable pieces of a larger sys- 
tem in which all the pieces can plug 
and play — for those who want to. 

From this perspective, multi- 
media begins to look like e\^rything 
connected with computers, con- 
sumer electronics, and entertain- 
ment. Grandiose? Maybe. But ask 
yourself why IBM is contemplating a 
half-billion dollar deal with Time- 
Warner, why IBM and AT&T are both 
working like crazy to get fiber-optic 
data rates to work over copper cab- 
ling, and why Apple is partnering 
with Sharp and Microsoft with Sony. 
Personal computers revolu- 
tionized typing, accounting, and 
publishing in the SO's. The 90's will 
see even more radical and perv^asive 
changes. 

That's the vision. Question: How 
will you participate? 

Product watch 

For years the phrase "reasonably 
priced tape backup" was a contra- 
diction in terms, but that is no longer 
the case, Figuns 1 shows one of the 
best deals around: the Jumbo 250 
from Colorado Memory Systems. 
It's a high-quality 250-megabyte 
QtC-80 tape drive that can fit in a 
3.5 inch or 5.25 inch bay, and it runs 
off a standard floppy-disk controller. 

The Jumbo 250 includes a spe- 
cial cable adapter that runs from the 
drive to the floppy controller; the 
cable fnom the floppy driveCs) plugs 




FIG. 1— COLORADO'S JUMBO 250 packs 250 megabytes of data on a $20 tape car- 
tridge in less than two hours. 



into the Jumbo's cable. Other than 
mounting the drive and copying 
software to your hard disk, that's 
the extent of installation, 

Backup software included with 
the drive runs in both menu-dnven 
and command-line modes; the latter 
allows unattended backup via 
scheduled batch files. If hard-disk 
capacity exceeds that of a tape, the 
software will store additional data 
on additional tapes. In addition, the 
software has several options, in- 
cluding password protection, the 
ability to back up and restore Novell 
NetWare bindery (user access 
rights) files, and several types of 
software -based data compression. 
Using compression is faster than 
not using it; I have no trouble back- 
ing up about 1 70 megabytes of data 
on a single tape in less than an hour 

You can use the menu-driven 
mode to create a tag list, or list of 
files to back up. and then use the 
command-line mode to back up the 
files on the list. One nice feature is 
its ability to append multiple backup 
volumes to the same tape, which 
gives you the ability to perform daily 
backups simply and quickly. My 
main complaint with the softw/are is 
that it forces you to restore files to 
their original locations. Sometimes, 
especially in a networked environ- 
ment, it's helpful to be able to re- 
store files elsewhere. 

Many installation options are 
available, including a case for exter- 
nal mounting, numerous special ca- 
ble and connector arrangements for 
special PC's (such as PS/2's), and 
several dedicated tape-controller 
boards that provide increased 



speed and hardware data compnss 
sion. Colorado also sells software 
to control the drive under severa 
varieties of Unix CSCO, Interactive, 
AT&T and Intel). 

The drive includes a one-year war- 
ranty, toll-free technical support, 
and access to a BBS, )f you shop 
around, you can pick one up for 
$250 mail order By way of com- 
parison, just a few years ago my 
trusty 80-megabyte Irwin backup 
unit cost three or four times that 
amount. For small offices and Win- 
dows power users, this is a must- 
have item. 

For more power and flexibility in 
tape backup software, check out 
Sytos Plus, It has several nice fea- 
tures, including the ability to work 
with multiple devices, including the 
Colorado, numerous digital audio 
tape (DAT) and 8mm formats, IBM's 
optical read/write disk, and hard 
and floppy disks; others are being 
added all the time. 

Sytos also supports OS/2, 
whereas Colorado does not Cyet). 
Sytos is routinely bundled with nu- 
merous high-capacity tape drives; 
the company claims more than a 
million users. 

Probably the nicest feature is 
Sytos* more integrated way of creat- 
ing backup sets. Whereas Colora- 
do's TAPE. EXE forces you to create 
tag lists and then manually create 
batch files with numerous param- 
eters, Sytos allows you (in the menu 
mode) to create "procedures" con- 
taining both tag list and configura- 
tion options, and then run various 
procedures from the command line. 

Sytos also has more extensive 



jmentation than Colorado. It 
jrs different kinds of backups, 

methods for creating backup 
sdules, 
ytos will allow you to restore 

from tape to new locations with 
' names; the only feature it lacks 
i that Colorado supplies) is a 
ge that indicates progress in for- 
cing a tape. 

ws bits 

Vhafs larger than a calculator 
I smaller than a notebook PC? 
tter yet. what's the size and 
ght of a paperback book, has a 
bit RISC processor a multitask- 
, object-oriented operating sys- 
1, and a 6- X 3-inch LCD screen 
pen input and visual display? 
3y: Apple's Newton, the first 
ndheld device for jotting, sketch- 
I, scribbling, figuring, doodling, 
iking lists, and subsequently 
wing that data to a larger comput- 
er another user via fax, modem, 
network. Initial specs include 
sh EPROM, 1 to 20 megabytes of 
^M, PCMCIA expansion cards, 
>und output, an infrared data link 
other Newtons and desktop 
acintoshes, and wired links to 
)th Macs and PC's. In addition to 
e text and graphics doodle pad. 
ewton will have an address book, 
:heduler. and an intelligent as- 
stant that will understand and act 
n commands like "fax this story to 
■rian." Newton is scheduled for re- 
.'Bse around January of 93, and re- 
ortedly will cost $500-$1000. 
here are also rumors of another 
43ple-developed handheld, this one 
ailed Sweet Pea, with CD-ROM 
ind the ability to play QuickTime 
icripts. It sounds a lot like the de- 
'ice Microsoft is developing with 
Sony. 

IBM has publicly demonstrated 
■DDI running on copper shielded 
.wisted pair(STP) cabling, thus pav- 
ng the way for a potential ten-fold 
ncrease in bandwidth to desktop 
-omputers— and other devices. 
Not to be outdone. AT&T Paradyne 
has announced a similar tech- 
nology, with claims that it could spur 
the nascent multimedia industry by 
delivering on-demand and interac- 
tive video services. 

Nintendo and Sega are going at it 
neck and neck, and in the process. 



PRODUCTS DISCUSSED 



• Jumbo 250, Colorado Memory 
Systems, 800 South Taft Ave., 
Coveland, CO 80537, (303) 
669-8000. 

• Sytos Plus, Sytron Corporation, 
124 Flanders Road, P.O. Box 5025, 
Westboro, MA 01581-5025. (508) 
898-0100. 



taking a pot-shot at the computer 
industry. Sega plans to introduce, 
two places by Thanksgiving a $300 
CD-based game that delivers quali- 
ty audio and live-action video; Nin- 
tendo plans to introduce a similar 
$200 unit early next year Sega is 
working with Sony to produce 
games related to movies, e.g., 
Spielberg's Jurassic Fbrk. Early re- 
ports indicate that Sega's device 
will include only half-speed, quarter- 
screen animation, whereas the Nin- 
tendo unit will do a full 30 frames 
per second. r-e 



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SLOPING VEE ANTENNA 



continued Jrom page 78 



phosphor-bronze wire is pre- 
ferred over stranded copper or 
aluminum wire because its 
spring qualities avoid kinks. It 
is almost impossible to tangle 
this kind of wire, especially im- 
portant if you want a field- 
transportable antenna system. 
Nevertheless, if phosphor- 
bronze wire wire is too expen- 
sive (about $2 per foot) or diffi- 
cult for you to obtain stranded 
copper or aluminum wire can be 
substituted. The shorting wire 
was 16 AWG bare, stranded-cop- 
per wire. 

Solder all connections if the 
antenna installation is perma- 
nent. But if you plan to set up 
and take down the antenna fre- 
quently, be sure that there are 
clean metal-to metal mechan- 
ical connections between all 
conductive components. 

The terminating resistors 



must be capable of handling a 
significant amount of power if 
the antenna is to be used for 
transmission. Non-inductive 
carbon-film power resistors, 
rated for 300 ohms ±10%, were 
specified for the test antenna. 
They had measured DC resis- 
tances of 307 and 314 ohms. As 
a general rule, the resistor 
power dissipation rating should 
be 10 to 20% of the maximum 
transmitter output power. 
Check the termination resistors 
for overheating. 

For receiver-only applica- 
tions, almost any low-power dis- 
sipating resistor with the cor- 
rect resistance value will be 
satisfactory. The test sloping- 
vee antenna showed good VSWR 
performance and reception 
with 300-ohm. 'A- watt carbon 
resistors. 

The measured impedance 
bandwidth of the 15 to 50 MHz 
vee is shown in Fig. 14. A net- 
work analyzer measured the in- 
put VSWR of about 150 feet of 



RG-213/U coaxial cable and 

was below 2:1 at all frequenci 
between 10 and 60 MHz; it w 
particularly good between 
and 30 MHz. The undulatio: 
in the VSWR curve shown 
Fig. 14 were caused by tl 
transmission line's frequenc 
dependent transformer actic 
acting on the sloping vee-inp 
impedance. 

VSWR measured directly 
the antenna input is slighl 
higher because cable loss lowe 
VSWR. This measurement w; 
made, and the VSWR was ju 
over 2:1 in the following band 
38 to 40 MHz; 44 to 47 MHz ;ai 
52 to 57 MHz. At all frequenci 
below 58 MHz, the sloping vei 
input VSWR was less the 
2.5:1. The test antenna easi 
exceeded the bandwidth desij 
objective, and it provides ve 
good broadband performanc 
In field tests the slope vee pe 
formed well as a transmitter a 
tenna down to frequencies 
about 4 MHz. H 



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owners! 1 (800) 826-7623, Annex, Visa, M/C ac- 
cepted. B & B INC., 4030 Beau-D-Rue Drive, 
Eagan, MN 55122. 



CLASSIFIED AD ORDER FORM 

To run your own cEaBsKt«<l ad, put onfl word on aach of tha linaa bvtow and saiid thlm torm along with your check to: 

Electronics Now Classified Ads, 500- B Bi -County Boulevard, Farmingdale, NY 1 1735 

PLEASE INDICATE inwhichcategoryof classified advertising you wish your ad to appear. For 

special hieadings, t lie re is a surcharge of $25.00. 

( 1 Plans/Kits ( ) Business Opportunities ( ) For Sale 

j ) Education/Instruction ( ) Wanted ( ) Satellite Television 

( S 

Special Category: $25.00 

PLEASE PRINT EACH WORD SEPARATELY, IN BLOCK LETTERS. 

(No refunds or credits for typesetting errors can be made unless you clearly print or type your 
copy.) Rates indicated are tor standard style classified ads only See below for additional 
charges for special ads. Minimum: 15 words. 



1 


6 


11 


1 6 ($49,60) 


21 ($65.10) 


26 ($80.60) 



12 



13 



14 



17 ($52.70) 



18 ($55,80) 



19 ($58,90) 



22 ($68.20) 23 ($71 .30) 24 ($74.40) 



26 ($80.60) 27 ($83.70) 28 ($86.80) 29 ($89.90) 



5 


10 


15 ($46.50) 


20 ($fi?.0O) 


25 ($77.50) 


30 ($93.00) 



31 ($96,10) 32 ($99.20) 33(5102.30) 34 ($105,40) 35 ($108.50) 

W^ accept MasterCard and Visa for payment of orders, tty^tj wish to use yotrr credit card to pay for your ad fill 
in tfie following additional information (Sorr/, no telephone orders can t>e accepled): 



Card Numtwr 



Expration Date 



Pleasa Print Name 



Signature 



IF YOU USE A BOX NUMBER YOU MUST INCLUDE YOUR PERMANENT ADDRESS AND PHONE 
NUMBER FOR OUR FILES, ADS SUBMITTED WITHOUT THIS INFORMATION WILL MOT BE ACCEPTED, 
CLASSIFIED COMMERCIAL RATE: (for firms or individuals otlermq commercial products or services) 
$3,10 pei word prepaid (no charge for zip code).. .MINIMUM 15 WORDS. S% discount for same ad in 6 
issues; tO% discount (or same aa in 12 issues within one year; if prepaid. NON-COMMERCIAL RATE: (for 
individuals who wani to buy or sell a personal item) S2.50 per word, prepaid... no minimum, ONLY FIRST 
WORD AND NAME set in bold caps at no exira charge. Additional bold face (not available as all caps) 55c 
per word additional. Entire ad in boldface, $3.70 per word. TINT SCREEN BEHIND ENTIRE AD: S3.85 per 
word. TINT SCREEN BEHIND ENTIRE AO PLUS ALL BOLD FACE AD: S4.50 per word EXPANDED 
TYPE AD: S't. 70 per word prapald. Entire ad in boldface, $5.60 per word TINT SCREEN BEHIND ENTIRE 
EXPANDED TYPE AD: $5.90 per word. TINT SCREEN BEHIND ENTIRE EXPANDED TYPE AD PLUS 
ALL BOLD FACE AO: S6.&0 per word. DISPLAY ADS: 1" x 2ii"— S410.00; 2" >: 2y<'— $820.00; 3 x 
2V4"^$1230,00. General inlormatlon: Frequency tales and prepayment discounis ate availaljte. ALL 
COPY SUBJECT TO PUBLISHERS APPROVAL ADVERTISEMENTS USING P.O. BOX ADDRESS WILL 
NOT BE ACCEPTED UNTIL ADVERTISER SUPPUES PUBLISHER WITH PERMANENT ADDRESS 
AND PHONE NUMBER. Copy to be in our hands on (he 5th ol the third month preceding the date o( (he 
issue, (i.e.. Aug. issue copy must l>e received by May 5th). When normal closing date falls on Sa(urday. 
Sunday 01 Holiday, issue closes on preceding working day. Send for (tie c(assified brochure Circle Numl»r 
49 on Ihe Free Information Card. 



TUBES, new, up to 90% off, SASE, KIRBY, 298 
West Carmel Drive, Carnnel, IN 46032, 

TV, notch filters, phone recording equipment, bro- 
chure $1.00. MICRO THinc. Box 63*025, Mar- 
gate, FL 33063. (305) 752-9202. 

SPEAKER repair. Ail nnakes — mtxiels. Stereo & 
professional. Kits available. Refoaming $18.00. 
ATLANTA AUDIO LABS, 1 (80O) 568-6971. 

ENGINEERING software and hardware, PC/ 
MSDOS. Circuit design and drawing, PCB 
layout, FFT analysis, mathematics, circuit 
analysis, etc. Data acquisition, generation, 
I/O PCB's, etc. Call or write for free catalog. 
(614} 491-0832, BSOFT SOFTWARE, 
INC., 444 Coiton Rd., Colunnbus, OH 
43207. 

CABLE TV Equipment. Most type available. 
Special: Oak M35B S39.95. Ho catalog. COD or- 
ders only. 1 (800} 822-9955, 



7 



* * * * PRESeiVfTlNG -H * * * 

CABLE TV 



T 



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jntROLD, HAMUN, OAK 

ArjO OTHER FAA»OUS MANUFACTUBEK 

• FrrJESt WABBAWry PSOGSAM AVAILAH.£ 

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■ ORDERS SHtPPED FROM SIDCK VWffHFN M HRS. 

• Aa MAJOR CBEDJT CARDS ACCEPTED 

FOR AU tNFORMATTON 
t-800-34S-892J 



PACIFIC CABLE CO.. INC, 

7325' ; Reseda Blvd. Depi I'li 

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80C52-Baslc mlcrocontrciier tioard. Basic inter- 
preter, 32K RAM, 16K Eprom, Eprom programmer, 
RS232, expansion connector Bare board with 
manual, scherratics $22.95. e0C52-Basic micro- 
processor chip $25.95. Assembled and tested 
$124.95. PROLOGIC DESIGNS, PO Box 19026, 
Baltimore, MP 21204. 

JERROLD, Tocom and Zenith "test" chips. 
Fully activates unit. $50.00. Cable de- 
scrambiers from $40.00, Orders 1 (SCO) 
4S2-7D90. Information (310) 867-0081, 

TOCOM-Jerrold Impulse-Scientific Atlanta 
Converters, two year warranties, also test mod- 
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PROTECT yourself and equipment from electrical 
shocks. Complete unit $98,95 SAFETY-UN- 
LIMITED, 1743 Baldwin Road, Yorktown, NY 
10598. S/H $5.00. 

SCIENTIFIC Atlanta 8500 series as low as 
S129.00, Starcom 6 as low as $149.00. All makes 
in stock. S,A.C. 1 (800) 622-3799. 



f 
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We specialize in a wide variety of techrical 
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10-Meter and FM conversion kits, repair books, 
plans, fiigh-performance accessories. Ttioiisands 
of satisfied customers since 1976f Catalog $2. 



CBC INTERNATIONAL 

P.O. BOX 31500RE. PHOENIX. A2 85046 



TEST-Aid* for testing units in full siMvive rnode. 
Slarcom VII, $40.00; Siarcom VI, 130,00; Star- 
corn DPBB, $50.00; Pionaer, $75.00; Tooom VIP 
55O3/5507, S26.00; S.A. call; Zenith, S25.00;N.E. 
ENGINEERING, (617) 770-3330. 

CABLE test Chips S-A 8550, S-A 8500 — 310, 
311, 320, 321 (specify) — $33.95. S-A 8580/338 
— $69.95. Tocom 5503'07 VIP — $33.95. Star- 
corn 6 — $33.95. Starcom 7 — $49.95. TELE- 
CODE, PO Box 6426-RE, Yuma, AZS5366-6426. 

OSCILLOSCOPE 50 MHz. Hewlett-Packard, sol- 
id state calibrated, manual $290.00. 1 (800) 
635-8335 X-159. 

SECRET cable descramblers! Build your own 
descrambler tor loss than $12.00 in seven easy 
steps. Complete instructions $10.00 Radio 
Shack parts list and free descramblinp methods 
that cost nothing to try included. HARRYWHITE, 
PO Box 1790D, Baytown, TX 77520. 



WIRELESS CABLE RECEIVERS 1.9 TO 2.7 GHi 



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30 [rtl PAflAEUUli UI^H aVbltM 'alM-UU 

30 CH ROD ummt. STSIEM S!«. 90 

30 CH CmSTALCOMTRQUf D SYSTEM S29< .95 
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CABLE converters, retail at wholesale prices. 
Overstock reduction sale. Example RTC-56 
$79.00 ea. Starcom 6 as low as $149.00. Ail 
makes available. MT. HOOD ELECTRONICS 
(206) 260-0107. 

PREVENT descrambler damage. Don't bite the 
bullet! Snooper stopper data blocker $29.95, VI &■ 
EO CONNECTIONS, 1 (800) 933-303B. 

STARCOM 6, Tocom, Oak, Pioneer, Scientific At- 
lanta, Zenith, as low as $39.00. KABLE KON- 
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RECEIVING TUBES 

OVER 3000 TYPES IN STOCK! 

Also fiard-to-find transformers, capaci- 
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SenH $2.00 lor our 32 psge cstBlog 

ANTIQUE ELECTRONIC SUPPLY 

6221 S. Maple Ave.-Tempe, AZ 352a3«602-820-541 1 




CABLE TV, Zenith, Jerrold, Oak, Scientific Atlan- 
ta, Hamlin, .Tocom, wtrolesaie to all. ULTIMATE 
CABLE PRODUCTS. (702) 646-6952. 

PCB: Printed circuit board art work made to yoyr 
specifications plotted on trarisparency. Multi layer 
and surface component capable. Circuit board 
production available, free estimate send sche- 
matic to NEGRON EMGINEERINQ, 159 Garfi^d 
Place, Brookiyn. NY 11215. Fax (718) 768-4028. 

CABLE TV descramblersi Absolutely the lowest 
prices! All major brands. Nolx>dy beats our prices! 
CABLE PRICE CLUB, 1 (BOO) 377-9742. 

NO 8O0# — no catalog — no bull! Just the best 
prices on Zenith and SA descramblers. Also avail- 
able— turrvonkits^_ca!IJ3^^ 

PRINTED circuit boards. Plated, etched and ma- 
chined to your design. Small runs OK. Call or 
write: SHORE PRINTED CIRCUITS, 36 Fairview 
Avenue, Little Silver, NJ 07739. (908) 747-6300, 1 
(800) 752-1574, Fax (908) 747-6301, 



POWER Inverter 100% portable 115V AC 12V DC 
100W from built in rechargable battery 13 lbs 
$185.00 plus $10.00 S/H. Circuit and brochure 
only $10.00 (Refundable when ordering inverter), 
PROGRESS TECH, 13222 Carolyn St., Cen-itos, 
CA 90701. 

PC boards: Professional quality, 30 day guaran- 
tee, beat all prices. A & D, PO Box 311 , Auburn, Ml 
48611.(517)662-6633. 

PLATED thru hole printed circuits, $25,00 mini- 
mum. Fast turnaround. For more information call 
AP CIRCUITS, (403) 250-3406 or BBS (403) 
291-9342(8,0,1). 



FREE CATALOG 



FAMOUS "FIRESTIK" BRAND CB ANTENHAS 

AND ACCESSORIES. QUALITY PRODUCTS 

FOR THE SERIOUS CBer. SINCE 1962 



FIRESTIK ANTENNA COMPANY 

2614 EAST ADAMS 

PHOENIX, ARIZONA 85034 



TUBES: "oldest," "latest." Parts and schematics. 
SASE for lists. STEINMETZ, 7519 (Vlaplewood 
Ave., R.E., Hammond, IN 46324. 

RESTRICTED technical information: Electronic 
surveillance, schematics, locksmithing, covert 
sciences, hacking, etc. Huge selection. Free 
brochures. MENTOR-Z, Drawer 1549, Asbury 
Park, NJ 07712. 



PLANS AND KITS 

FASCINATING electronic devices! Dazersl 
Lasers! Transmitters! Detectors! Free energy! 
Tesia! Kits/assembled I Catalog $4.00 (refunda- 
ble). QUANTUM RESEARCH, 17919-77 Ave., 
Edmonton. AB.T5T 2 S1. 

HOBBY/broadcasting/HAM/CB/surveiilance 
transmitters, amplifiers, cable TV, science, bugs, 
other great projects! Catalog $1.00. PANAXTS, 
Box 130-F9, Paradise, CA 95967, 



REMOTE CONTROL KEYCHAIM 



Cnmpi'.'to Vi mini-itansmltter 
ftnd +5 vdr RF recctvo^' 

'a butltj your fl ivn ^v/to ftinrm 

>><iH,yD fide) S 3 ttiippina 
5 5JSt9.95, 10@5l^-95 




Visitectlnc, n.,i 14156, Ftemnni,cri 94539 
(510(651-1425 Fax(510)651--S45-1 



DESCRAMBLER kits. Complete cable kit $44.95. 
Complete satellite kit $49.95. Add $5.00 shipping. 
Free brochure. No New York sates. SUMMIT RE, 
Box 489, Bronx, NY 10465. 

VIDEOCIPHERII/satellite/scanner/cable/ama- 
teur/cellu tar/repair manuals, modification books, 
software. Catalog — $3.00. TELECODE, PO Box 
6426-RE, Yuma, AZ 85366-6426. 

KENWOOD & ICOM service bulletins. 175-1- 
paoes covering all models. $39.95. Catalog — 
$3.00. CODs (602) 782-2316 / FAX (602) 
343-2141. TELECODE, Box 6426-RE, Yuma, AZ 
85366-6426. 

FREE! Fabulous catalog of sensational kits, LNS 
TECHNOLOGIES, £0993 Foothill Blvd., Suite 
307 R. Hay ward, CA 94541-1511, 

SURVEILLANCE, counter-surveillance, secur- 
ity devices. Room and plione monitors, bug de- 
tectors, alarms, stung uns. etc. Send $3.0iD for 
catalog. HOME VU MERCHANDISE, Qox 38371, 
Detroit, 1^1 48238. 

ROBOTICS, Build-it- Yourself! Hobby, personal, & 
service rotiot types — designs, parts and plans. 
Catalog $1.00, directory $10.00. IPC, Suite 
251RE. 1019-A Old Monrovia Rd„ Huntsvllle, AL 
35806. 



REMOVE 

LEAD 

VOCALS 

From 
Record* iCDs 
513444 2276 



Build this kit which removes !« 
vocals from standard stereo rvcor 
CD's, Up«s or FM broadcasts. S 
aEong with Ihe background mui 
Use with any home compom 
stereo. Additional kit adds reverb 
your voice, then mixes rl with mu( 
Pre-Hssembled fcioards also av; 
abie. Caii or write tor free Inl 
Weflfler TechnalEigies, 147 
LindseyRd., Ml Orab, Ohio 4515 



SURVEILLANCE transmitter kits tune from &. 
to 305 MHz. Mains powered duplex, telephone 
room, combination telephone/room. Catalog witi 
Popular Communications, Popular Elec 
Ironies and Radio-Electronics book reviews c 
"Electronic Eavesdropping Equipment Ds 
sign," $2.00. SHEFFIELD ELECTRONICS, PC 
Box 377785-C, Chicago, IL 60637-7785. 

CELLULAR hackers bible. Theory — hacks — 
modifications — $53,95. TELECODE, PO Bo: 
6426-RE, Yuma, AZ 85366-6426. 



SATELLITE TV 



FREE catalog — Lowest prices worldwide, SKY 
VISION, 1012 Frontier, Fergus Falls, MN 56537. ■ 
(BOO) 334-6455. See full page ad the Shoppe 
section, 

SATELLITE TV — Do it yourself — major brandi 
discounted, we'll beat everyone's price. Call LAR- 
RY (609) 596-0656. 



CABLE TV 

DESCRAMBLER LIQUIDATION! 



FREE CATALOGI 

Hamlin Combo* $44, Oak MSSB $6C (min, 5), etc. 



WEST COAST ELECTRONICS 

For Information: B18-709-1758 

Catalogs & Orders: 800-628-9656 



BUSINESS OPPORTUNITIES 

YOUR own radio station! Licensed/unlicensed 
AM, FM. TV, cable. Information $1.00. BROAD- 
CASTING, Box 130-F9, Paradise, CA 95967. 

LET the government finance your small business, 
Grants'loans to $500,000. Free recorded mes- 
sage: (707) 449-8600, (KS1). 

MAKE $75,000.00 to $250,000,00 ye arty or mote 
fixing IBM color monitors. No investment, start 
doing it from your home (a telephone required). 
Information, USA, Canada $2.00 cash lor bro- 
chure, other countries $10.00 US funds. RAN- 
DALL DISPLAY Box 2168-R, Van Nuys, CA 
91404 USA. FAX (816) 990-7SQ3. 

CONTINGENCY patent licensing, t\to lees any- 
time. Three decades experience:law, technology, 
negotiations. PROPAT INTERNATIONAL COR- 
PORATION, 441 Summer Street, Stamford, CT 
06901. (203) 325-3344. 



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inly NRl gets you started fast with real-wor/d training designed around 

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raw-Hili Continuing lildueation Center 
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ECheck one FREE rotolog tmly 

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For Career OfpportLinilirph 
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\xft 



Desktop PubtifihiDg & Design 
Elpf^tronic Music Teclinology 
Home in.sperctioD 
Automotive Servicing 
Basic Electronics 
Bookkeeping & Accoimling 



IVamp 



{Pleujie print) 



Age 



.A^ldrr.^s 



Citv 



SlatP 



Zip 



3-092 



I 
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en 



EB 
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J 103 



A Monumental Selectioi 



Si 



111 
-Q 



TestlMeasuretnent and Prototype Equipment 



Jain«co Soldorless Breadboards 




Jamcco's long-lasung breadboards tenure screcji-printcd color coordinates and are 
suitable for many kinds of prototyping ind circuit design. Larger models feature a 
heavy-duty aluminum backin| with voltage and grounding posts. 



Put 



Dtm. 



Contact Binding 
Pointi Ppill Pci 



PmI 



Dim* 



Contact Binding 
Pointi Poiti fn« 



JE21 3JZ5i2.125 
JE23 6.50 k 2.125 
JE24 6.501! 3. 1 25 



400 

830 

1,360 



W.95 
6.95 

12.95 



JE25 
JE26 

JE27 



6.500 1 4.25 
6.S75i5.75 
7.250 1 7.50 



1,660 3 $17.95 
2.3M 4 24.95 
3,220 4 32.95 




Addiflional GoldStar 
Oscilloscopot 

GS904RD 40Mhz 2 channel 

oscilloscope $799.95 

GS8 1 00 1 OOMhi 3 channel 

o.^cillfismpc 1349.95 

Call for additional Goldstar 
tat equipment 

J AMECO 

COMPUTER PRODUCTS 



^ 24 Hour Toil-Frft: Order Hotline 

1 •800*831 *^a42 





GoldStar 20MHx Dual Trace Osciilesce|ie 



The perfea unit for today's 
testing snJ inosuremen[ 
needs[ Features include a G" 
CRT display, an^ bandwidth 
from DC to 20 MHi. The 
GoldStar oscilloscope comes 
with two 4OMH2 ptobcs, two 
fuses, power cord, operation 
manual, schematics and block 
and wiring diagram. It s 
lightweight and portable with 
a two-year warranty. 



GS7020 $399.95 

NoHonal and Intel 
Databooks 



400026 National General Purpose 

U near Devices Dacabook ...$19.95 

400039 Nitionjl Logit Daubooti .,19.95 

4000 1 5 National Data Aiqiusiiion 

Linear Devices Daiabook 1 1.95 

400104 Njrional Special Purpose 

Unear Dcv'iea Databook 11.95 

400044 National LS/S/TTl. 

Daiabool: 14.95 

230843 Intel Mcmoi)- ruiibook 24.95 

270645 Inrel Embedded Coniioller 

PtDcessati Datlbcok 24,95 

AjMinofiul diitaheoks atwilahk! 



Metex Digital MulHmelers 

• Handheld, high accuracy • Measures AC/ DC voltage, tt 
AC/DC current, resistance, diodes, continuity, and 
transistor current gain (except M3900) 

• Manual tanging w/ovcrloaif protection 

• Comes with prob», batteries, case ant! manual 
M3650 & M4650 only: 

• Also measures frequency and capacitance 

M3800 3.5 Digii Multinieier $39.95 

M3610 3.5 Digit Muiiiraeier $59.95 

M3900 
M3650 
M4650 







f 



M46 



3.5 Digit Muliimcicr 



..$59.95 

3-5 Digit MLiitimcECF w/lTM|LW!ricy 
& capacitance $74.93 

4,5 Digii w/frcqucncy h capacnance 
& da [1 hoid swiich $99 3 5 








EPROMs 



PftNo, 



Price 



TMS2516 $4.25 

TMS2564, ..,.5.95 

TMS27I6 5.95 

1702A 3.95 

2708 4.95 

2716 3.95 

2716-1 4.25 

27C16 4.25 

2732 4,95 

Z732A-20 4.49 

2732A-25 3,49 

2732A-4S 2.95 

27C32 4.95 

2764-20 3.95 

2764-25.. .3.75 

2764A-20 3.75 



IC Test Clip Series 

• Test Clips are designed for lemponiy 
connections to DIP components 

• Heavy-duiy spring loaded hinge provides 
posirive contact 

Part No. Description E 

JTC16 16-pin (for 8. MSf 16-pin ia)..$: 

JTC20 20-pin (for 1 8 & lO-pin IQ) ..t 

JTC24 24-pin : 

JTC28 28-pin t 

JTC40 40-pin 1] 

for your programming needs 

P»« No. Eiia Pan Nn. ; 



2764A-25 $3.49 

27C64-15 3.95 

27C64-25 3.49 

27C64-45 2,95 

271280TP 2,49 

27128-20 7.95 

27128-25 7.75 

2712aA-15 4.95 

27128A-20 4.75 

27128A-25 3,75 

27C128-15 5.75 

27C1 28-25 7.95 

272560TP 4,19 

27256-15 5.49 

27256-20 5.29 

27256-25 4.89 



27C256-12 $< 

27C256-15 — '. 

27C256-20 ,' 

27C256-25 ■" 

275120TP 4 

27512-20 .1 

27512-25 ! 

27C5 12-12 :, 

27C512-15 .< 

27C512-20.,,.. t 

27C512-25 ! 

27C01O-J5 S 

27C020-15 i; 

27C020-20 1! 

68766-35 4 



A.R.T. EPROM 
Programmer 




• Erases all EPROM's * Erases 1 chip ij 
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• UV iniensiry: fiSOO LW/CM^ 



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Upgrade your existing computer system! Janteco will help you upgrade easily and economically, 
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This keyboard fcaiures 12 Rinciion keys, 
sep34:atc curwraud numeric kcyj, 

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• LED Indicaiois for Num, Qpj» 
anti Scroll lock ktyi. 



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Jameco 803ft6SX Motherboard 

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■ Baby moiherboard (S.S'sii") 

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■ Intel 803S7SX/compnible math coprocessor socket 
-AiMIBIOS 

• Si): 16-bit and rwo S-bit expansion bu$ sints 

• One-year warranry 

JE3616SN , $249.95 




Toshibo 1*44MB3,5'- 

Floppy Dick Drive 

PC/XT/ AT and compatibles 

^tiblc with DOS versions 33 or highi 

ds all necessary installation hard^-^rc 

vIB formatted high density mode 

3 formatted low density mode 

TH X 4"W X 'y.TD (acttiaJ drive siic) 

year manufacturer's warranty 



U.. — $99.95 

Many more upgrade products available! 




IBM Gontpoliltl* Power Supjpliac 

JE1036: 

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0.5A.+ 1 2V @ 8A, -1 2V @0.5A 

• 200 wans output power 
•Switch able beiween 1 1 0/220 V 

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1 50 watt PC/XT power supply $69.95 

200 wan AT power supply $89.95 



JE1030; 

• Output: +5V @ 1 5A, -5V @ 0.5A, 
+ 12Vg>5.5A,-12V@0.5A 

• 1 50 watts output power 

• Switchablc between 1 1 0/220 V 

• Buik-in fan 

• Skc: 9.5"L x 5.5"Wx4.625"H 

• One-year warranty 

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JE1030 
JE1036 



*!iSSt 






Additknai 



^ 





o. t.9 


jo 


....J.25 


)2 

M 

as 


25 

25 

29 


14 


39 


JO 


25 


32 

74 


25 

29 


76 

86 


..... .49 

25 


112 

123 


25 

.39 


a75 !"!!!"!!""""!".!"!] 


39 

35 


;i93 


59 


;244 


69 




;245 


69 




i373 

1374 


69 

69 




Unsar ICs* 

No. 


1-9 




g2CP 


....$.59 


\ 


ITT 

24N 


59 

35 


3 
3 
> 
! 

7 
1 
1 
1 
1 

^ 

[3 


36Z 


....1.09 


39N 


45 


55V 

56N 


29 

49 


23CN 


49 


41CN 


..... .29 


458N 


39 


488N 


45 


489N 


.45 


I2(I03A , „.. 

<J14M 


69 

....2.49 


5532 

)5T 


....1.19 

... . 45 


li 


.T 


45 



* Call far a cimplfrt lifting oflCi 



HnVIIIO^^ 



Part No. Functioii 



-£[i££ 



41256-120 

412S6-150 

511OO0P-80 

511000F-ia 

4125WB.80 

421000A9A-*0 

421000A9B-60 

42KIO0A9B-70 

421(KKIA9B-80 



25CK DIP 


120ns.. 


..S1.69 


256 K DIP 


tSOns.. 


...1.59 


1MB DIP 


SOns... 


5.99 


1MB DIP 


tOOns. 


....5.49 


256KS1MM 


eOns.... 


..16.95 


1MB5IPP 


sons.... 


..54.95 


1MB SIMM 


60ni,... 


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IMBSiMM 


7(Jn!... 


..59.95 


1, MB SIMM 


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43PXX 3/4 watt, 1 5 lurn $S9 

63PXX 1/2 watt, I turn 89 

T^Huislon And Diodas 



Vvn ^P, Price 

PN2222 $.12 
PN2907 .12 
1N4004 .10 
2N2222A ,25 
1N4735 .25 
2N3904 .12 



Pan No. Price 

1N751 $.15 

C106B1 .65 

2N440I 

1N4148 

2N3055 

IN270 



.15 
.07 
.69 
.25 



Sivltchos 



JMT123 SPOT, on-on (togiJc) $1.15 

206-8 SPST, 16-pin (DIP) 1.09 

MPC121 SPOT, on-otr-on (toggle) ..1.19 
MS 102 SPST, momcntarj' 

(push-hution) .39 

'Additional compoiieiin aimildbU 



Pan No. 



Connectors 

Description 



Pfiie 



DB25P Male, 25-pin $.65 

DB25S Female, 25-pin 75 

DB25H Hood 39 

DB25MH Metal Hood 1.35 

LEO* 

XC209R Tl, (Red) $.14 

XC556G Tl 3/4, (Green) 16 

XC556R Tl 3/4, (Red) 12 

XC556Y Tl 3/4, (Yellow) 16 



Call or write for your 
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IC Sockets 



Low Profile 
Pan No. 



Price 



Wire WrsplCold) Lcvd*2 
Pan No. Price 



8LP 


$.10 


8WW 


14LP 


.11 


14WW 


16LP 


.12 


16WW 


24LP 


.19 


24WW 


28LP 


.22 


28WW 


40LP 


.28 


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Fn6 band monoral graphic aqualizflr. Allc^ uss ol 
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ERG. lnc.,"Sman Force"™ 
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T-4UnltB S Units 10 Unit* 



PANASONIC TZP 145 
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$88.00 
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ADD-ON DECODERS 

SB-3 (NEW) $50.00 $45.00 

*SB-3 FACTORY $45.00 $39.00 

SA-3 $56.00 $50.00 

DTB-3 $65.00 $55.00 

KNI2A-2 or 3 $49.00 $45.00 

*KAMILIN MLD 1200-3 $49.00 $40.00 

•ZENITH SSAVI $1 65.00 $1 49.00 

SA-DF $159.00 $139.00 



JERROLD DPV7 
JERROLD DPBB 
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MERROLD DRX-3-DIC 
JERROLD DRZ-3-DIC 
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OUTPUT 
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CalSfofntA Penal Cods #E93-0 Forbids us rFom 
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Prices subject to change wtlbout notice. 



Please Print 



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EACH 



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TOTAL 
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AddreEB_ 
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Exp. Date 



DECLARATION OF AUTHORIZED USE- 1, the undersigned, do hereby declare 
under penotty of perjury that ail products purchased, now ajid in the future, 
will only bB used on TV systems with ail applicable federal and state laws. 
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For Free Catalog, or to place an order call 
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I 
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I 
m 

a 

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3 



107 



IS out 




Or is it? 



Si 



I 
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T' 

lU 
108 




# 



Only you can prevent forest fires. 



A Public Service of the USM Rarest Service 
and your SutE Fotesiet, 



HARDWARE HACKER 



continued from page 93 



Whole Earth Review. There are 
bunches of independent and non- 
profit inventor's organizations out 
there. One I can heartily recom- 
mend is Ed Zimmer's Inventor En- 
trepreneur Network. For other 
regional sources, check out the 
Encyclopedia of Associations that 
you will probably find at your local 
library. 

No, I just do not know of anyone 
anywhere who is dumb enough to 
buy raw, unproven, or undeveloped 
ideas. But I do know of several 
someones who sometimes might 
be interested in looking at tightly 
targeted products if those products 
am now in their pre-production pro- 
totypestage and currently under ac- 
tive end-user beta testing. 

For instance, Mark Gottleib of 
Design Tech Internationa! is looking 
for innovative approaches to low- 
end consumer electronics, es- 
pecially for those items that can be 
blister packed and need no con- 
sumer smarts to use. 

Dennis Carper of Redmond Ca- 
ble is seeking tested and proven 
interconnect and adaptor products 
that clearly solve obvious and well- 
defined problems. 

John Simonton of PAIA Cand a 
frequent author in Electronics 
Now) sometimes seeks out items 
with kit possibilities, especially if 
they are related to MIDI or elec- 
tronic music. 

And Steve Ciarcia of his Micro 
Mint is occasionally interested in 
any embedded processor applica- 
tions — if they are unique. 

Besides my own PSRT RoundTa- 
ble on GEnie, you might also want to 
check out their HOSB, short for 
Home Office and Small Business. 
I've also formed my loosely knit 
Synergetics Consultants Network 
that centers on our voice helpline. 
Give me a call if you need more 
information. 

New tech lit 

From Texas Instruments, seven 
pounds of revised linear data books. 
Volume I is on op-amps: volume II is 
on A/D, DSR and video; and vol- 
ume III is on voltage regulators and 



really oddball stuff, 

A pair of very readable ne 
books: The Triumphs and Trials of £ 
Organ Builder, by Jerome Marl 
owitz, CEO of Allen Organ, and put 
lished by the Vox ttumania Pres: 
Among the other things, it reveal 
how trivially easy it is to have an 
technically solid and perfectly vali 
patent busted in court. Just bs 
cause some epsilon minus does nc 
happen to like you. 

Plus Accidental Empires by th 
pseudonym Robert X. Cringley 
newly published by Addiso 
Wesley. Subtitled How the boys c 
Silicon Valley make all their millions 
battle foreign competition, and sti 
can 't get a date. This book has 
double handful of very funny one 
liners in it. But otherwise it read 
like something that Cringley wouli 
write. 

I've found ve/y few trade journali 
devoted to electronic servicing 
One useful new one, though, i; 
MSM, the Magazine of Servict 
Management. The magazine puts « 
big emphasis on computer service 
and identification of sources fo 
printer and disk-drive replacemen 
parts and assemblies. 

A great collection of navigatior 
books, GPS (global positioning sat 
ellites) and otherwise, is offered b) 
the Navtech Information Service 
And a new Spread Spectrum Scent 
labor-of-love newsletter has recently 
started publication. 

Two firms apparently still offer tof 
octave generators and other classic 
electronic organ chips. The first is 
Fistell Microelectronics and the 
other is Keyboard Systems. The lat- 
ter also builds workaround replace- 
ment modules for chips that are 
tmly unavailable. 

Turning to some of my own prod- 
ucts, yet another obvious and major 
product selling resource is my re- 
cently improved Incredible Secret 
Money Machine II. The autographed 
copies are available per my nearby 
Synergetics ad. 

As usual, I have gathered many of 
the resources mentioned together 
into the Names & Numbers or the 
Product Marketing Resources side- 
bars. Be sure to check those out 
before you use our no-charge tech 
helpline or call for a free hacker se- 
crets brochure. R^ 



TV DOWNCONVERTER 



continued from page 84 



vided for you to make your 
1 board, and the parts-place- 
nt diagram is shown in Fig, 

^rst install resistors R1-R13, 

d R15-R17. Next, install all 

iacitors except the chip ca- 

citors and CIO. Install mixer 

., and then wind and install 

Js LI, L2, L3, L5, L6, L7, L8. 

;;oils Ll. L2, and L3 are three 

rns each of 20 AWG tinned 

re wound around a No. 8 

rew as a form (see Fig. 5) and 

en stretched to a length of 0.3 

ch with the turn spacing 

enly maintained. All three of 

.ose coils must be tapped as 

lown in Fig. 5. The lead from 

1 (which can be coaxial 50- 

im line) has its center conduc- 

ir soldered to Ll at % turn from 

le grounded end. Resistor R5 

. soldered l'/2 turns from the 

id of L2 that connects to R6, 

7. and C8, Coil L3 is tapped at 

turn from the grounded end. 

Coils L6 and L7 are 8 turns 

ach of 22 AWG enamelled wire 

round on a No. 8 screw. The 

crew is removed after winding 

he coil. Coil LB is 9 'A turns of 

12 AWG enamelled wire, wound 

he same way as L6 and L7. 

lowever, after winding, the No. 

J screw is removed and a ferrite 

-uning slug is screwed into the 

vinding as shown in Fig, 5, RF 

:hoke L5 is installed as if were a 

resistor 

Install Q2, Q3, Dl. D2, and 
D3, Now install the chip capaci- 
tors. Chip capacitors require 
special installation pro- 
cedures — and they all mount on 
the solder side of the PC board. 
Figure 6 shows where all of the 
chip capacitors, CIO (which 
we'll get to in a moment}, and Ql 
are mounted on the solder side 
of the board. As for the chip ca- 
pacitors, first tin the area on the 
PC board where a chip is to be 
installed. Then hold the chip in 
place with the tip of a small 
screwdriver or tweezers and 
tack solder one side. After its 
tacked in place, fully solder both 
sides of the chip. 

Now install Ql. whose long 
lead is the drain. Make sure you 



use a grounded iron and work 
in a static-free area, Tteat Ql as 
you would a delicate CMOS IC, 
The tuning potentiometer (R14) 
can be mounted in different po- 
sitions for added flexibility; it 
can be mounted off the board 
for remote tuning purposes. 

Make sure all holes marked 
"G" in Fig. 4 have jumper wires 
passed through them and sol- 
dered on both sides of the PC 
board as shown in Fig. 7. Also, 
both sides of the board must be 
grounded together with copper 
foil tape, also as shown in Fig. 7. 
Once the tape is in place, solder 
both sides. 

Next make capacitor CIO. 
T^ke a small square of G-IO, 
0.062 material (the same as the 
PC board material) and trim it 
to a yi6-inch square. Install it on 
the solder side of the board as 
shown in Fig. 8. Connect coax- 
ial 50-ohm cables to Jl and J2, 
and DC power leads to D3 and 
ground. Set trimmer capacitors 
CI. C5. and C6 to about 20% of 
maximum, and set C9 to about 
80% of maximum. If you use 
R14, it can be set halfway. rfR14 
is not used, RIO should be tem- 
porarily connected to a supply of 
about + 8 volts. Figure 9 shows 
the author's prototype. 

Tone up 

Timing consists of peaking 
the tuned circuits for best re- 
ception. Using a frequency 
counter connected across R12, 
adjust C9 for a nominal fre- 
quency of 370 to 375 MHz, If 
installed, R14 should vary that 
by about ± 15 MHz. If R14 is not 
installed, to +12 volts applied 
to RIO should do the same. The 
oscillator might stop if less than 
2 volts is applied to RIO — which 
is acceptable as long as you can 
obtain a frequency range of 30 
MHz. 

Connect the converter to a TV 
set tuned to channel 3 and to an 
external antenna for ATV recep- 
tion. Find a signal and peak Ll, 
L2, and L3 for the best picture. 
You can also use an RF signal 
generator tuned to 435 MHz if 
no on-the-air signal is available. 
As a last resort, you can also 
peak Ll, L2, and L3 on noise. 

It is also possible to experi- 
mentally peak the converter on 



UHF channels 14, 15, or 16 if no 
other signals are available. Set 
C9 for a L.O. frequency of 
around 410 to 420 MHz. Note: 
This is only to see if everything 
works if there's no other way to 
obtain an ATV signal and you 
have no access to a signal gener- 
ator. You will later have to re- 
peak the converter to 420 to 450 
MHz. 

If a sweep generator is avail- 
able, simply peak the converter 
for a response as shown in Fig. 
10. By trimming CIO (use a file 
on the edge of it) you can also 
experiment with the coupling 
and resultant bandpass shape. 
You can also do this with a cali- 
brated RF signal generator and 
a receiver and/or RF voltmeter, 
but this will take more time. 

The converter should be 
mounted in a weatherproof 
metal box, if outdoor use is in- 
tended. A metal box reduces 
stray signal pickup, and also 
protects the converter from 
damage. 

If you will be remote-tuning 
the converter (as was shown in 
Fig. 3). the converter should be 
mounted right at the antenna 
or very close to it. That permits 
a short cable from Jl to the an- 
tenna, reducing signal losses. 
The converter can then be 
mounted as far as 300 feet from 
the TV monitor, R-E 



DRAWING BOARD 



continued from page 96 



case, you should trim the level be- 
cause the circuits we'll be building 
expect a 1-volt signal. 

The only other thing to notice 
here — there just isn't much to the 
circuit at all— is that the video signal 
being fed to the base of the tran- 
sistor is related to both positive volt- 
age and ground through R1 and R2, 
The circuit is going to run on a regu- g 
lated 5-volt supply; it must be jS 
steady because the level of the sup- U} 
ply voltage is going to have an effect a 
on the level of the video. Wire up the S 
circuit shown in Fig, 4 and get the S 
video source in place. When we get ? 
together next time we'll start de- * 
signing some kind of circuit to screw 
up the signal. R-E 109 



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